Bihar Mandal politics presents a puzzle that the familiar contest between two men cannot explain. Between March 1990 and January 2024, the government of Bihar was constructed six separate times out of recombinations of the same three parties: the Rashtriya Janata Dal, the Janata Dal (United) and the Bharatiya Janata Party. Twice the Janata Dal (United) governed with the Bharatiya Janata Party and then broke with it; twice it governed with the Rashtriya Janata Dal and then broke with that party instead; and on each occasion the excluded third party, never a new entrant, waited as the principal opposition and returned to office at the next recombination. A politics organised around two personalities should not behave this way. A politics organised as a three-party architecture, in which each party rests on a distinct social substrate and government is always a pairing drawn from three, behaves exactly this way. That is the claim defended in this article.

The Puzzle of the Recombining Parties

The standard treatment of Bihar’s politics since 1990 is a biography in two volumes. In the first, Lalu Prasad Yadav rules: the Janata Dal victory of March 1990 carries the Yadav leader to the chief ministership, the Mandal Commission’s recommendations give his coalition its programme, and fifteen years of Rashtriya Janata Dal government follow, under Lalu Prasad Yadav himself from 1990 to 1997 and under his wife Rabri Devi from 1997 to 2005. In the second volume, Nitish Kumar rules: the Janata Dal (United) and Bharatiya Janata Party victory of November 2005 installs the Kurmi engineer as chief minister, a governance programme replaces the mobilisation politics of the earlier period, and Nitish Kumar remains the state’s central figure through every subsequent realignment. Read this way, Bihar’s political history is a duel, and every election is a round in it.

The duel framing survives because both men are genuinely central. It fails because it cannot explain the behaviour of the system between their appearances. It cannot explain why the Bharatiya Janata Party, absent from the binary altogether, held the deputy chief ministership of Bihar for most of the period from 2005 to 2020 and supplied the national government with which every Bihar coalition after 2017 had to reckon. It cannot explain why Nitish Kumar’s governments changed partners in June 2013, July 2017, August 2022 and January 2024 while his own party’s seat tally moved within a narrow band, as if the constant in Bihar politics were not a man but a structure that kept reasserting itself through him. And it cannot explain why the Rashtriya Janata Dal, pronounced finished after its 2005 defeat, returned as the single largest party in the assembly elections of 2015 and 2020 and recorded the largest single-party vote share in 2025. Structures, not biographies, explain recurrence.

A second standard treatment reaches deeper. The Mandal-substrate reading, given its most influential scholarly form in Christophe Jaffrelot’s India’s Silent Revolution, published in 2003, treats the politics of the period as the working out of a single transformation: the political rise of the Other Backward Classes after the Mandal Commission’s report of 1980 and its implementation in August 1990. On this reading, Lalu Prasad Yadav and Nitish Kumar are both products of the same upheaval, rival heirs of the Mandal moment competing for its constituency, and the substantive story is the transfer of power from the upper castes who had governed Bihar since 1952 to the backward castes who displaced them. This reading explains a great deal, and the sections below rely on Jaffrelot’s Bihar chapters heavily. What it does not explain is differentiation. If one substrate produced both camps, the reading struggles to say why the backward-caste electorate organised itself into two durable and hostile parties rather than one, why a third party anchored in the old upper-caste order survived the revolution and grew inside it, and why the coalition combinations rotated with a regularity that caste demography alone does not predict.

The three-party-architecture reading defended here starts from the observation the other two treatments treat as background. Bihar’s politics after 1990 is a system of three parties, each resting on a substrate that the others cannot absorb. The Rashtriya Janata Dal rests on the Yadav and Muslim coalition that the Mandal mobilisation consolidated between 1990 and 1995. The Janata Dal (United) rests on a pan-Other Backward Classes coalition anchored in the Kurmi caste cluster and extended deliberately to the Extremely Backward Classes and the Mahadalit categories. The Bharatiya Janata Party rests on the upper-caste base of Bhumihars, Brahmins and Rajputs, extended after 2014 into sections of the backward and Dalit electorates by cadre organisation and national leadership. Because no substrate can be absorbed by a rival, no party can be eliminated; because no party has governed alone since 2005, government is a pairing; and because pairings exhaust their internal logic, pairings rotate. The six governance configurations of the period, from the Rashtriya Janata Dal dominance of 1990 to 2005 through the Janata Dal (United) and Bharatiya Janata Party coalition installed in January 2024, are the architecture working, not a sequence of accidents.

The evidence base for the argument is documentary before it is interpretive. The Election Commission of India’s statistical reports for the Bihar assembly elections of 1990, 1995, 2000, 2005, 2010, 2015, 2020 and 2025 and for the Lok Sabha elections held in the state across the same span supply the seat and vote figures on which the substrate claims rest. The government-formation record, the notifications, the letters of support and the swearing-in dates preserved in the Bihar government documentation, supplies the coalition chronology. The policy record of the post-2005 governments, including the Bihar State Archives’ holdings of the implementation reports on the Mahadalit category, the Janani Suraksha Yojana and the women’s empowerment schemes, supplies the governance variations that the architecture predicts. Where interpretation divides scholars, the division is named: Jaffrelot’s silent-revolution thesis of 2003, Sanjay Kumar’s election studies from the Centre for the Study of Developing Societies in Delhi, and Ashwani Kumar’s Community Warriors of 2008, his study of caste armies and the state in Bihar, frame the disagreement this article adjudicates.

A note on the statistical spine is owed before the narrative begins, because the architecture claim stands or falls on counts rather than impressions. The seat and vote figures used throughout are drawn from the Election Commission of India’s statistical reports on the Bihar assembly elections of 1990, 1995, 2000, the two elections of 2005, and those of 2010, 2015, 2020 and 2025, and on the Commission’s reports for the Lok Sabha elections held in the state in 1991, 1996, 1998, 1999, 2004, 2009, 2014, 2019 and 2024. Three properties of these reports matter for the argument. They record party labels as the Commission recognised them on the day, so that the Janata Dal of 1990 and the Rashtriya Janata Dal of 2000 are distinct entries whose continuity must be argued, as this article argues it, from personnel and electorate rather than assumed from the label. They record votes at the constituency level, which lets the substrate claim be tested where it must be tested, in the distribution of a party’s vote across districts of differing caste composition, and not merely in its statewide total. And they are continuous across the whole period, a single instrument reading a changing system, which protects the comparison of 1995 with 2025 from the charge that the measures changed with the decades. The coalition chronology is taken from the government-formation record, the notifications of appointment and the dated resignations and oaths in the Bihar government’s documentation, a record that fixes the six shifts to days rather than seasons. The policy claims are taken, wherever the article makes them, from the implementing departments’ own published reports and from the implementation files preserved at the Bihar State Archives, including the Mahadalit Mission’s reporting, the health department’s Janani Suraksha Yojana returns and the rural development department’s records of the women’s self-help programme. The interpretive literature is used for what it is: Jaffrelot for the revolution’s sociology, the Centre for the Study of Developing Societies surveys directed in Bihar by Sanjay Kumar for the voters’ own distributions, Ashwani Kumar for the countryside’s violence, and Jeffrey Witsoe for the participant’s understanding of the first substrate’s politics. Where these sources conflict, the conflict is the article’s subject; where they converge, the convergence is its evidence.

Bihar Mandal Politics Before 1990: The Long Substrate

The architecture of 1990 was assembled from materials laid down over four decades, and Bihar Mandal politics cannot be read without the prehistory. The Congress that governed Bihar from 1952 under Sri Krishna Sinha was itself a caste coalition wearing a national uniform. Its ministry balanced Bhumihar, Rajput, Brahmin and Kayastha leadership at the top with a legislature in which the backward castes held seats without holding power, a distribution that the Bihar chapters of Jaffrelot’s India’s Silent Revolution document in constituency-level detail. The arrangement held while the Congress could distribute office downward; it began to fail when the backward-caste politicians inside and outside the party concluded that the distribution was a ceiling. Karpoori Thakur, the barber-caste socialist who served as chief minister from December 1970 to June 1971 and again from June 1977 to April 1979, was the first leader to convert that conclusion into policy. His government appointed the Mungeri Lal Commission on backward classes in the 1970s and, in November 1978, implemented its recommendations in a reservation formula that allotted places in state employment across backward classes, the more backward among them, women and the poor of the forward castes. The formula was modest in scale and furious in reception; upper-caste agitation against it contributed to the fall of his government in April 1979. It also established the template: in Bihar, reservation was a state-level political weapon a decade before the Mandal Commission’s implementation made it a national one.

The second layer of the substrate was organisational. The movement Jayaprakash Narayan led from Bihar in 1974, the call for Sampoorna Kranti issued at Gandhi Maidan in Patna on 5 June 1974, and the Janata Party victory of 1977 trained a generation of Bihar politicians outside the Congress altogether. Lalu Prasad Yadav, elected to the Lok Sabha from Chhapra in 1977 at the age of twenty-nine, Nitish Kumar, Sushil Kumar Modi of the Bharatiya Janata Party’s predecessor current, and Ram Vilas Paswan all passed through the student and movement politics of the 1970s in Patna. The Janata experiment collapsed nationally by 1979 and the Congress returned to office in Bihar in 1980, but the personnel of the post-1990 system had been formed, and the state’s politics had acquired a non-Congress organisational memory that most northern states lacked. When the Congress decayed in Bihar during the 1980s, through the chief ministerships of Jagannath Mishra and Bindeshwari Dubey and the discrediting violence of the Bhagalpur riots of October and November 1989, in which official and press estimates converged on a toll above one thousand, most of them Muslim weavers of the Bhagalpur silk belt, there existed an alternative political class ready to inherit the state.

The third layer was the national Mandal decision itself, and its Bihar reception showed that the state was not a passive recipient. When Prime Minister V.P. Singh announced on 7 August 1990 that the Mandal Commission’s recommendation of 27 percent reservation for the Other Backward Classes in central government employment would be implemented, Bihar already had a backward-classes government in Patna: the Janata Dal had won 122 of the state’s 324 assembly seats in March 1990, and Lalu Prasad Yadav had taken office as chief minister on 10 March 1990. The Bihar government’s response to the anti-Mandal agitation in the autumn of 1990 was the most consequential of any state. When Lal Krishna Advani’s Rath Yatra entered Bihar in October 1990, the state government arrested Advani at Samastipur on 23 October 1990, an act that contributed to the Bharatiya Janata Party’s withdrawal of support from the V.P. Singh government in New Delhi while cementing, in Bihar, the identification between the ruling party and the defence of Mandal. Bihar thereby acquired, before any other large state, a governing party whose legitimacy rested explicitly on the Mandal settlement, and a Muslim electorate whose allegiance the Bhagalpur riots and the Samastipur arrest jointly transferred from the Congress to that party for a generation.

When did Bihar’s three-party pattern begin?

Bihar’s three-party pattern began with the assembly election of March 1990 and consolidated across the elections of 1995 and 2000. The Janata Dal victory established the Mandal governing party, the Bharatiya Janata Party’s growth established the upper-caste pole, and the splits of 1994 and 1997 divided the Mandal inheritance into two parties.

The prehistory matters to the argument because it disciplines the claim. The three-party architecture was not designed; it precipitated out of a specific sequence, a reservation formula in 1978, a movement in 1974, a national decision in 1990, that gave Bihar three distinct political inheritances rather than one. Uttar Pradesh, which shared the Mandal moment, produced a different architecture because its inheritances differed, a comparison the bellwether-laboratory comparator in this series develops. Tamil Nadu produced bipolar stability for reasons the bipolar-stability comparator sets out. Bihar’s distinctness lies in the triple inheritance, and the four-dimensional comparative framework that organises this pillar’s state studies is the instrument that makes the distinctness visible: on the dimensions of party-substrate depth, coalition necessity, leadership institutionalisation and centre-state bargaining, Bihar scores as the case where substrates are deepest and coalition necessity is absolute.

Substrate One: The Rashtriya Janata Dal and the Yadav-Muslim Coalition

The first substrate was consolidated between 1990 and 1997 and has outlasted every obituary written for it. Its core is the Yadav community, the state’s largest single caste cluster, concentrated in the dairy and agrarian economy of north and central Bihar, politically organised since the 1960s through the socialist tradition of Ram Manohar Lohia and, in Bihar, through Karpoori Thakur’s reservation politics. To the Yadav core the elections of the 1990s attached the state’s Muslim electorate, roughly a sixth of the population, whose transfer from the Congress was sealed by the Bhagalpur riots of 1989 and by the Samastipur arrest of 1990, which together persuaded Muslim voters that the Janata Dal government would use state power for their physical protection in a way the Congress had failed to do. The resulting combination, conventionally abbreviated in Bihar’s political vocabulary as the M-Y equation, gave the party of Lalu Prasad Yadav a floor of support that no subsequent election has removed: the Rashtriya Janata Dal’s vote share has not fallen below a fifth of the state’s total in any assembly election since 1995, including the catastrophe of 2010, when it won 22 seats on a vote share still above 18 percent.

Lalu Prasad Yadav’s own account of his project, stated across his speeches of the 1990s and defended by his party since, was that the transfer of dignity preceded the transfer of goods: that a Yadav or Muslim villager who could sit on a cot in the presence of the landlord, address the police officer without the honorific of submission, and see his caste fellow in the chief minister’s chair had received something real, which the language of roads and school buildings could not measure. Jeffrey Witsoe’s Democracy against Development, published by the University of Chicago Press in 2013 after ethnographic fieldwork in Bihar, gives this defence its most serious scholarly form: Witsoe argues that the politics of the Lalu period centred on lower-caste assertion and the capture of state institutions by groups historically excluded from them, and that judging the period solely by developmental outputs mistakes what its participants understood themselves to be doing. Jaffrelot’s account converges from the opposite direction: the silent revolution in Bihar, he writes, was real but socially narrower than in the south, concentrated in the Yadav stratum of the backward classes, which is precisely why a rival backward-caste politics remained available to be organised against it.

The indictment of the same years, made by the party’s opponents at the time and developed in the governance literature since, is equally specific. It holds that the state apparatus was subordinated to the ruling coalition’s protection requirements, that kidnapping for ransom became an organised industry in the state’s towns, that the treasury fraud known as the fodder scam, in which roughly 950 crore rupees were drawn from animal husbandry department treasuries on forged bills across the 1980s and 1990s, expressed the period’s governing method, and that investment and administrative talent left the state in consequence. The court record gives parts of this indictment documentary form. The fodder scam surfaced in January 1996 with the exposure of fraudulent withdrawals from the Chaibasa treasury; the Patna High Court ordered a Central Bureau of Investigation inquiry in March 1996; the Bureau’s chargesheet of June 1997 named Lalu Prasad Yadav; and on 25 July 1997 Lalu Prasad Yadav resigned the chief ministership. A special Central Bureau of Investigation court at Ranchi convicted him in the first of the fodder cases in September 2013, and further convictions followed in December 2017 and in 2018. Lalu Prasad Yadav’s defence, maintained through the proceedings, was that he had himself ordered departmental inquiry into the withdrawals, that the fraud was the work of officials and suppliers, and that the prosecution was a conspiracy of his upper-caste opponents and the investigating agencies against a backward-caste leader; his supporters repeat the claim, and the article records it as his stated position, while the convictions stand as the settled legal record.

The organisational consequence of July 1997 was the founding of the Rashtriya Janata Dal. The Janata Dal’s national leadership under Sharad Yadav moved to distance the party from its Bihar chief minister once the chargesheet was filed; Lalu Prasad Yadav answered by constituting his following as a separate party at New Delhi on 5 July 1997, taking the great majority of the Bihar legislature party with him, and installing Rabri Devi as chief minister on the day of his resignation. The episode fixed the substrate’s defining feature: the party was, from its first day, the institutional form of a coalition of castes and a family leadership fused together, so that an attack on the leader registered with its voters as an attack on the coalition’s dignity. That fusion explains the party’s floor. It also explains its ceiling: the same fusion that guarantees the Yadav-Muslim base has repeatedly limited the party’s capacity to present itself as a plausible government to the Extremely Backward Classes and Dalit voters whom its rival courted, a limitation visible in the seat distributions of 2010 and 2025 alike.

What is the Yadav-Muslim coalition in Bihar politics?

The Yadav-Muslim coalition is the Rashtriya Janata Dal’s electoral substrate: the Yadav community, Bihar’s largest caste cluster, joined with the state’s Muslim electorate, whose allegiance moved from the Congress after the Bhagalpur riots of 1989 and the Samastipur arrest of October 1990, together delivering the party a durable floor of about a fifth of the statewide vote.

The darker underside of the substrate’s first decade is documented in Ashwani Kumar’s Community Warriors, published in 2008, the mandatory scholarly source on the period’s violence. Kumar shows how the collapse of a single-party order in the Bihar countryside produced private caste armies as instruments of local power: the Ranvir Sena, raised in 1994 by Bhumihar landlords under Brahmeshwar Singh, fought the Naxalite squads and the parties of the rural poor across the central Bihar districts, and the massacres at Bathani Tola in July 1996, where 21 people were killed, and at Laxmanpur Bathe in December 1997, where 58 were killed, marked the extremes of a war that the state government proved unable or, in the charge of its critics, unwilling to suppress. For the architecture argument, the caste-army decade matters because it demonstrates that the substrate was never merely electoral: each party’s base was also a social fact in the village, armed at the margins, which no coalition arithmetic at Patna could dissolve. The parties recombine; the substrates persist. That asymmetry is the engine of the whole system.

Substrate Two: The Janata Dal (United) and the Pan-Backward Alternative

The second substrate was built in deliberate opposition to the first, out of the Mandal inheritance’s other half. Its founding grievance was the Yadav concentration of the silent revolution: the claim, pressed by Kurmi, Koeri and other non-Yadav backward-caste politicians from the early 1990s, that the Mandal settlement in Bihar had been captured by a single caste and its leader, and that the Extremely Backward Classes, the most backward stratum of the Mandal Commission’s own classification, had received neither office nor policy from the government that ruled in their name. The organisational vehicle was assembled in stages. The Samata Party, constituted in 1994 by George Fernandes and Nitish Kumar after their break with the Janata Dal, carried the grievance into alliance with the Bharatiya Janata Party from 1996. The Janata Dal (United) took its consolidated form in October 2003, when the Samata Party merged into the Janata Dal faction led by Sharad Yadav, and Nitish Kumar emerged as the combination’s Bihar leader and its claim to govern.

The substrate’s architecture was an exercise in addition. The Kurmi cluster, Nitish Kumar’s own community, concentrated in the Nalanda and Patna belt, supplied the anchor. Around it the party assembled the Koeri cultivating castes, the Vaishya trading communities classified among the backward classes, and then, by specific policy instruments, two constituencies the Rashtriya Janata Dal had not organised. The first was the Extremely Backward Classes, the cluster of more than a hundred small castes, from the Nonia salt-makers to the Mallah boatmen, who together form the largest bloc in the state’s caste demography yet had never been addressed as a bloc by any governing party. The second was the Mahadalit category, created in 2007 on the recommendation of the Bihar State Mahadalit Commission, which grouped the most deprived of the state’s Scheduled Caste communities, initially eighteen of the twenty-two, for targeted welfare delivery through the Bihar Mahadalit Vikas Mission. Each instrument converted an administrative category into a political constituency, and each constituency was told, accurately, that the rival party had not created it. The method is the substrate’s signature: where the Rashtriya Janata Dal consolidated a coalition that already existed socially, the Janata Dal (United) manufactured constituencies by policy and bound them by delivery.

The leadership style matched the method. Nitish Kumar’s public persona, the engineer-administrator who had served as a Union minister in the Vajpayee government between 1998 and 2004, was constructed against the Rashtriya Janata Dal’s idiom: where Lalu Prasad Yadav performed the village elder’s familiarity, Nitish Kumar performed the file. His supporters’ claim for the post-2005 record, the claim of restored administration, of roads and electricity and bicycles for schoolgirls, is examined against the policy documents in a later section. The architectural point stands apart from the claim’s merits. The Janata Dal (United) substrate made its leader the state’s indispensable coalition partner: because the pan-backward coalition overlapped neither with the Yadav-Muslim base nor with the upper-caste base, its leader could pair with either, and the history of Bihar government formation from 2013 to 2024 is the record of that structural fact being exploited in every available direction.

The substrate also carried a weakness symmetrical to the Rashtriya Janata Dal’s. A coalition manufactured by policy is bound to the manufacturer. The Janata Dal (United) won 115 seats in 2010 at the head of a coalition and 71 in 2015 inside another, but its independent vote, tested when it fought the 2014 Lok Sabha election largely alone after leaving the Bharatiya Janata Party alliance, collapsed to two seats; and in 2020, fighting as the junior partner in seats contested, it fell to 43 seats while its ally won 74. The party’s substrate is real but thinner than its leader’s reputation, dependent on alliance arithmetic to convert votes into seats at the rate its history shows. Critics of Nitish Kumar, including the Rashtriya Janata Dal leadership under Tejashwi Yadav, make the point in partisan form, charging that the Janata Dal (United) leader’s repeated changes of alliance across 2013, 2017, 2022 and 2024 reveal opportunism rather than architecture. The sections below take the charge seriously and answer it on the evidence: the switches follow the architecture’s logic with a regularity that personal opportunism alone would not produce, since on each occasion the switch exchanged one pairing for another available pairing and left the substrate untouched.

Substrate Three: The Bharatiya Janata Party, from Upper-Caste Anchor to Coalition Broker

The third substrate is the oldest and the most transformed. The Bharatiya Janata Party’s Bihar inheritance descends from the Jana Sangh current whose pre-1980 organisational history, traced in this series through the BJP’s pre-1980 organisational antecedent, gave the party a cadre skeleton in the state’s towns and a base among Bhumihar, Brahmin and Rajput voters that the Mandal decade threatened with permanent exclusion from power. The party’s Bihar leadership of the 1990s, Sushil Kumar Modi prominent among them, made the strategic decision that defined the substrate’s modern form: rather than contest the Mandal settlement frontally, the party would attach itself to the settlement’s anti-Yadav half. The alliance with the Samata Party from 1996, renewed with the Janata Dal (United) after 2003, placed the Bharatiya Janata Party inside every non-Rashtriya Janata Dal government of the period while its own campaign organisation, built through the Rashtriya Swayamsevak Sangh’s affiliated networks in the state’s districts, grew beneath the alliance’s shelter. The party won 39 assembly seats in 1990, 41 in 2000 as an alliance partner, 55 in October 2005 and 91 in 2010: a growth curve achieved without ever holding the chief ministership, which is the clearest evidence that substrate-building, not office, was the party’s Bihar method for two decades.

After 2014 the substrate widened. The national government’s saturation welfare delivery, cooking-gas connections, housing, toilets and direct cash transfers to farmers, gave the party a route into backward-caste and Dalit households that its Bihar organisation had not built on its own, and the party’s candidate selection followed the demography: backward-caste and Extremely Backward Class candidates in winnable seats, a Dalit state leadership cultivated in figures such as Nityanand Rai among the Yadav-adjacent electorate of the north and, at the national level, the elevation of leaders from the state’s backward communities. The Lok Sabha results measure the widening. In 2019 the National Democratic Alliance won 39 of Bihar’s 40 Lok Sabha seats, the Bharatiya Janata Party taking 17 of the 17 it contested; in 2024 the alliance won 30, the party 12, in a verdict the post-Mandal arithmetic break context of the 2014 inflection helps to frame. A party that began the period as the electoral refuge of the castes Mandal displaced had become, by its own organisation’s claim and by the seat record, a party with a plausible vote in every substrate, though its irreducible core, the one that votes for it in defeat as in victory, remained the upper-caste and trading communities of its first decades.

What changed in Bihar after the November 2005 election?

The November 2005 election replaced fifteen years of Rashtriya Janata Dal government with a Janata Dal (United) and Bharatiya Janata Party coalition under Nitish Kumar. The Election Commission’s statistical report records the Janata Dal (United) at 88 seats and the Bharatiya Janata Party at 55, against 54 for the Rashtriya Janata Dal, making coalition Bihar’s normal condition thereafter.

The third substrate’s existence is what the binary framing cannot accommodate, and its behaviour is what the Mandal-substrate framing cannot predict. A reading of Bihar as a backward-caste polity with an upper-caste residue cannot explain why the residue’s party held the deputy chief ministership from November 2005 to June 2013 and again from July 2017 to August 2022, nor why two successive chief ministers, in 2017 and 2024, chose its partnership the moment their other pairing failed. The party’s role in the architecture is the broker’s role: it is the only partner whose substrate threatens neither of the others’ cores, since its upper-caste base does not compete for the Yadav, Kurmi or Extremely Backward vote that the two Mandal parties divide between them. That structural innocence, not any leader’s preference, is why the road back to office in Patna has run through the Bharatiya Janata Party’s door more often than through any other.

The Counter-Mobilisation of the 1990s and the Making of the Alternatives

The three substrates were not assembled in sequence but in collision, and the collisions of the 1990s explain why the second and third parties took the forms they did. The first response of the displaced order to the Mandal government was extra-parliamentary and upper-caste: student agitation against reservation in the autumn of 1990, the brief flare of caste organisations such as the Bihar Sena, and the political venture of Anand Mohan Singh, the Rajput strongman whose Bihar People’s Party, launched in 1993, attempted to give the upper-caste reaction a party form before its founder’s legal ruin and the venture’s absorption into the larger currents ended it. The failure of the frontal response taught the displaced order the lesson the third substrate is built on: in a state where the reserved categories form the overwhelming majority of the electorate, an upper-caste party wins only as a partner, never as a principal, and the Bharatiya Janata Party’s alliance discipline from 1996 onward is that lesson institutionalised. The second response came from inside the Mandal camp itself. The Samata Party’s founding in 1994 by George Fernandes and Nitish Kumar, on the charge that the Janata Dal government had become a family concern distributing the revolution’s gains to one caste, institutionalised the grievance of the non-Yadav backward classes and gave it, in the alliance with the Bharatiya Janata Party from 1996, an electoral vehicle. The elections of the decade record the two responses maturing: the Janata Dal’s 167 seats of 1995 marked the first substrate’s peak; the same decade’s parliamentary contests showed the Samata and Bharatiya Janata Party combination rising in the state’s Lok Sabha contingent; and the 2000 assembly verdict, in which the Rashtriya Janata Dal’s 124 seats made it the largest party while the combined opposition outpolled it, announced the pairing era five years before the February and October elections of 2005 made it fact. The architecture was complete by 2003, when the Janata Dal (United) took its consolidated form: three parties, three substrates, and a state whose government would thereafter be a negotiation among them.

The Six Shifts: Bihar’s Governance-Coalition Timeline, 1990 to 2024

The architecture’s operation is visible in the sequence of governments, and the sequence is best read whole. Table 1, the Bihar three-party substrate map and six-shift coalition timeline, sets out the substrates and the shifts in a single citable form: the first three rows map each party’s substrate and signature, and the following six rows record each governance configuration, its anchor election and its defining policy signature.

Element	Composition and Anchor Events	Governing Signature
RJD substrate	Yadav and Muslim coalition consolidated 1990 to 1995; party constituted 5 July 1997	Dignity politics and protection of the coalition; reservation defended as the state’s first charge
JDU substrate	Pan-backward coalition anchored in the Kurmi cluster; Samata Party 1994; consolidated party October 2003	Administrative categories converted to constituencies: Extremely Backward Classes addressed as a bloc; Mahadalit category created 2007
BJP substrate	Upper-caste base of Bhumihar, Brahmin and Rajput voters; alliance strategy from 1996; cadre expansion after 2014	Coalition brokerage and national welfare delivery; growth without the chief ministership
Shift One, 1990 to 2005	Janata Dal, then RJD, government; 167 of 324 seats in 1995; 124 of 324 in 2000	Mandal implementation; fodder-scam proceedings from 1996; Rabri Devi chief minister from 25 July 1997
Shift Two, 2005 to 2015	JDU-BJP coalition; 88 and 55 seats in October 2005; 115 and 91 in 2010; JDU exit June 2013	Law-and-order restoration claim; Mahadalit category 2007; bicycle and uniform schemes for schoolgirls
Shift Three, 2015 to 2017	RJD-JDU-Congress grand alliance; 80, 71 and 27 seats in 2015	Prohibition enacted April 2016; seven resolves programme; ended by JDU exit July 2017
Shift Four, 2017 to 2022	JDU-BJP coalition restored July 2017; National Democratic Alliance 125 seats in 2020, BJP 74 and JDU 43	BJP becomes the larger assembly partner for the first time; national welfare saturation
Shift Five, 2022 to 2024	RJD-JDU coalition restored August 2022; Tejashwi Yadav deputy chief minister	Caste-based survey of 2022 to 2023 published October 2023; reservation enhancement attempted and struck down in 2024
Shift Six, 2024 onward	JDU-BJP coalition restored January 2024; alliance wins 30 of 40 Lok Sabha seats in 2024 and 202 of 243 assembly seats in 2025	BJP largest party of the alliance in seats; Nitish Kumar sworn in for a tenth term on 20 November 2025

Shift One, from 1990 to 2005, is the only single-party phase of the architecture, and its length is the exception that defines the rule. The Janata Dal’s 122 seats of March 1990 became, after the party’s Bihar unit reconstituted itself as the Rashtriya Janata Dal in 1997, a dominance resting on the M-Y floor and on the fragmentation of every alternative. Its internal history nonetheless prefigured the architecture: the Samata break of 1994 created the second substrate while the first still governed, and the Bharatiya Janata Party’s alliance with the breakaway from 1996 created the pairing that would end the phase. The phase closed not with an ideological verdict but with an administrative one: the February 2005 election produced a hung assembly in which the Rashtriya Janata Dal remained the largest party with 75 seats yet could not form a government, President’s rule followed from March 2005, and the October 2005 election installed the second shift. The Election Commission’s reports for the two 2005 elections, read together, show the substrate floor intact and the superstructure collapsed: the party’s vote held near a quarter of the total while its capacity to attract partners and floating voters vanished.

Shift Two, from 2005 to 2015, established the pairing principle. The Janata Dal (United) and Bharatiya Janata Party coalition of November 2005 joined the second and third substrates against the first, won 206 of 243 seats in 2010 in the most complete assembly verdict of the period, and governed for a decade on the policy signature examined below. Its end was architectural, not electoral: in June 2013 the Janata Dal (United) terminated a seventeen-year alliance because the Bharatiya Janata Party’s national elevation of Narendra Modi threatened, in Nitish Kumar’s stated reasoning, the secular credentials on which his coalition’s Muslim and Extremely Backward support partly rested. The decision cost the party its 2014 Lok Sabha collapse, two seats from forty, and delivered the third shift by reaction: the grand alliance of 2015, in which the two Mandal parties buried a twenty-year rivalry to stop the third substrate’s party from governing alone.

Shift Three, from 2015 to 2017, is the architecture’s proof of concept. The Rashtriya Janata Dal, the Janata Dal (United) and the Congress won 178 of 243 seats in November 2015, the Rashtriya Janata Dal emerging as the largest party with 80, and the combination demonstrated that any two substrates could pair against the third. Its collapse in July 2017, when Nitish Kumar resigned citing the corruption charges then filed against his deputy Tejashwi Yadav and formed a government with the Bharatiya Janata Party within a day, demonstrated the corollary: pairings are instrumental, terminable at the moment their internal charge exceeds their external use. Shift Four restored the second pairing and ran it through the 2020 election, which redrew the hierarchy inside it, the Bharatiya Janata Party winning 74 seats to the Janata Dal (United)’s 43 and becoming for the first time the larger party of the state government it served. Shift Five, from August 2022, repeated Shift Three’s combination with the roles of grievance reversed, and produced the caste-based survey whose findings, published on 2 October 2023, recorded the Extremely Backward Classes at about 36 percent of the state’s population and the Other Backward Classes at about 27 percent, figures both Mandal parties claimed as vindication. Shift Six, from 28 January 2024, restored the second and fourth shifts’ pairing, and the elections of 2024 and 2025, examined in the closing sections, tested whether the architecture itself had begun to change.

The Reservation Thread: Mandal Politics in the Strict Bihar Sense

Because the national history of the Mandal Commission belongs to another pillar of this series, the reservation thread is followed here only where it runs through Bihar’s own law and politics, and in Bihar it runs early, deep and continuously. The state’s reservation politics predates Mandal’s implementation by twelve years. The Mungeri Lal Commission, appointed by the Bihar government in the 1970s to identify the state’s backward classes, reported in 1976 with a list of 128 castes and a scheme of preferential treatment; Karpoori Thakur’s Janata Party government implemented its core in November 1978, reserving 26 percent of state government posts across a graded formula, 12 percent for the backward classes, 8 percent for the most backward among them, 3 percent for women and 3 percent for the poor of the castes outside the scheme. The formula, remembered in the state as the Karpoori formula, matters to the architecture for two reasons. It created, a decade before 1990, the administrative distinction between backward and most backward on which the second substrate’s entire later politics of the Extremely Backward Classes rests; and it demonstrated, in the agitation that helped bring Karpoori Thakur’s government down in April 1979, the political cost that made reservation in Bihar thereafter a question of which coalition could defend it, not whether it would exist. When the national implementation came in August 1990, Bihar was the one large state where a Mandal government already held office and a Mandal formula already stood in the state’s own service rules: the national decision landed on prepared ground, which is why its Bihar consolidation was faster and deeper than anywhere else in the Hindi belt.

The thread runs through every subsequent shift. The Rashtriya Janata Dal governments defended the reservation settlement as the state’s first principle and extended its logic into the panchayats, where the 2001 and 2006 local elections operated with reserved seats for backward classes, the most backward and women in combination. The Janata Dal (United) governments refined the instrument rather than opposing it: the Mahadalit category subdivided the Scheduled Caste quota’s delivery, the Extremely Backward bloc received its panchayat reservation in 2006, and the women’s reservation of 50 percent in panchayat institutions made Bihar a national precursor. The Bharatiya Janata Party, governing only in coalition, acquiesced in the state’s reservation consensus while its national organisation developed the alternative route of economising the question, the 10 percent quota for the economically weaker sections enacted nationally in 2019 and applied in Bihar’s services without the resistance that a frontal challenge to caste reservation would have met. No party in the architecture proposes the settlement’s repeal; the contest is over its subdivision, its percentages and its credit, which is the surest sign that Mandal in Bihar is not a party programme but the constitution of the political field itself.

The thread’s working-out in the survey years returned Bihar to the centre of the national question. The caste-based survey conducted by the state government through 2022 and 2023, whose caste findings the government published on 2 October 2023, counted the state’s population by caste for the first time since 1931 and returned the proportions on which the period’s closing argument turns: Extremely Backward Classes about 36 percent, Other Backward Classes about 27 percent, Scheduled Castes about 20 percent, and the communities outside the reserved categories about 15 percent. The grand alliance government then in office raised the state’s reservation total to 65 percent by legislation in November 2023, and the successor coalition of January 2024, formed by the same chief minister with the opposite partner, defended the enhancement in court rather than repealing it, a pairing-market detail that says more about the settlement’s hold than any speech. The Patna High Court struck the enhancement down in June 2024, holding that the state had not made out the extraordinary circumstances the Supreme Court’s ceiling jurisprudence demands, and the question travelled upward to the Supreme Court and outward to the national arena, where the demand for a countrywide caste census, Bihar’s instrument generalised, was accepted by the Union government in April 2025. The bridge to the pillar that follows this one stands exactly here: what Bihar did with Mandal as a state, the nation spent thirty years deciding whether to do as a republic, and the state’s three-party architecture is the machine that kept the question open.

The Substrates District by District

The architecture is a statewide abstraction, and its claim to explain Bihar survives only if the substrates can be seen at ground level, where Bihar’s five historic regions distribute them unevenly. In Mithila, the Maithili-speaking north-east, the Brahmin presence in the old Congress order was dense, the Darbhanga and Madhubani belts supplied the Bharatiya Janata Party with some of its most durable assembly segments, and the Rashtriya Janata Dal’s Yadav organisation contested the same ground through the cattle and dairy economy of the Kosi floodplain. In the Kosi and Seemanchal districts to the east, Purnea, Katihar, Araria and Kishanganj, the Muslim share of the population rises toward a third and beyond, the Surjapuri and Kulhaiya Muslim communities give the M-Y equation a local density it has nowhere else, and the region’s politics repeatedly escapes the three-party frame at the margin: the All India Majlis-e-Ittehadul Muslimeen won five Seemanchal seats in 2020 on a specifically Muslim representation claim, four of whose legislators later crossed to the Rashtriya Janata Dal, an episode that confirms the architecture by showing the price of exit from it. In Magadh, the central Bihar districts of Gaya, Jehanabad, Arwal and Aurangabad, the caste-army war of the 1990s was fought village by village between the Ranvir Sena and the Naxalite formations, and the Janata Dal (United)’s Mahadalit and Extremely Backward instruments found their most receptive electorate in the districts the war had exhausted. In Bhojpur and the Shahabad belt to the west, the Koeri and Kurmi cultivating castes anchor the second substrate, the region’s tradition of peasant militancy from the Kisan Sabha era onward gives every party’s agrarian rhetoric a local archive, and the Bharatiya Janata Party’s Rajput and Bhumihar networks contest the same seats. A party system whose components map onto regions this distinctly is not a mood; it is a settlement geography, and coalition formation at Patna is the negotiation among these geographies conducted by other means.

Migration overlays the geography without dissolving it. Bihar’s working-age men staff the construction sites, factories and farms of Delhi, Punjab, Maharashtra, Gujarat and Kerala in the millions, and the remittance economy that their absence built sustains the households whose women, mothers and parents vote in Bihar’s elections. The political consequence, visible in the survey record Sanjay Kumar’s teams assembled across the 2015 and 2020 elections, is a electorate split by experience: the migrant worker encounters the Indian state in its developed form elsewhere and returns with a comparison, while the household in the village encounters the Bihar state in its local form, the ration shop, the primary health centre, the police station. The second substrate’s delivery politics spoke to the household; the first substrate’s dignity politics spoke to the memory of humiliation that the migrant’s father carried; the third substrate’s national politics spoke to the migrant himself, in the idiom of the nation he worked in. The special intensive revision of Bihar’s electoral rolls conducted in 2025, and the controversy over migrant voters’ documentation that attended it, showed the migration question entering the architecture’s machinery directly: whose names stand on the rolls of a state a third of whose workforce is absent is a question about which substrate gets counted, and every party in Patna treated it as such.

The panchayat layer completes the ground picture. Bihar’s panchayat elections operate under reservations that the state extended ahead of most of India: seats and offices reserved for the Extremely Backward Classes from 2006, and a 50 percent reservation for women in panchayat institutions that the Janata Dal (United) government enacted in 2006, among the first such provisions in the country. The mukhiya’s office became, in consequence, a training ground and a prize for precisely the constituencies the second substrate was assembling, and the wives and daughters of village Bihar acquired a formal political presence that the assembly parties then had to address as voters in their own right. Prohibition’s constituency, examined above, was built in this layer. So was the feedback loop of the delivery state: the beneficiary lists of the housing, toilet and gas schemes are panchayat-level documents, contested at the panchayat level, and the parties’ village organisations live by them. An architecture visible in the assembly, the districts and the panchayat alike has earned the name.

Bihar and the Federation: The State as Bargainer

The architecture also governs how Bihar bargains with the Union, and the bargaining record supplies an independent test of the reading, since a personality system would bargain in personalities and a substrate system in blocs. Bihar’s standing grievance against the federal fiscal order is old: the freight equalisation policy of the Union government, in force from 1952 to 1993, neutralised the mineral-rich east’s locational advantage by equalising transport costs on coal and steel across the country, a policy Bihar’s economists and politicians of every party cite as the founding injury of the state’s industrial backwardness, and whose abolition came too late to restore the lost decades. The successor grievances are shared across the substrates with a unanimity found nowhere else in the state’s politics. Every Bihar government of the period demanded special category status for the state, the demand Nitish Kumar carried to a public campaign in 2012 and repeated inside both national alliances he joined, and every Bihar party supported the demand in the assembly regardless of which pairing held office. The Union’s fiscal commissions’ formulas, which distribute revenues partly by population and partly by criteria on which a poor, populous, low-revenue state scores ambiguously, are criticised in Patna in the same vocabulary by finance ministers of all three parties.

What the architecture predicts, and the record shows, is that the bargaining is conducted not by the state as a unit but by the pairing in office, trading the bloc the pairing commands. The second substrate’s leader extracted railway and infrastructure commitments as a Union minister between 1998 and 2004 and as an alliance partner thereafter; the first substrate’s leader held the railway ministry in the United Progressive Alliance government of 2004, when the ministry’s largesse toward Bihar’s rail map was a matter of national comment; the 2024 realignment, which returned the Janata Dal (United) to the National Democratic Alliance at the moment the Bharatiya Janata Party needed its twelve members in New Delhi, was followed within months by Union budget provisions for Bihar’s airports, highways and flood control that the state’s press recorded as the pairing’s price. Flood control itself, the Kosi river’s management across the Nepal border, is a federal subject on which Bihar’s governments of every pairing have pressed the Union without success proportionate to the damage the river does in the state’s north in the worst years, 2008’s breach at Kusaha, which displaced some three million people, being the period’s defining catastrophe. The federal layer thus confirms the state layer: Bihar’s weight in the Union is the weight of its pairing of the moment, and the Union’s concessions arrive addressed to the partner whose defection the national alliance fears, which is the architecture operating at the scale of the republic.

The Lok Sabha Layer: Bihar in the National Arithmetic

Bihar elects 40 members to the Lok Sabha, a contingent reduced from 54 when Jharkhand separated in November 2000, and its parliamentary verdicts run on the architecture’s logic with a national twist: the pairing that forms Bihar’s government and the pairing that contests its parliamentary seats need not coincide, and the divergences are diagnostic. In 2009 the Janata Dal (United) and Bharatiya Janata Party, then governing Patna together, won 32 of the state’s 40 seats between them. In 2014 the same two parties, separated by the rupture of June 2013, met as enemies: the Bharatiya Janata Party’s alliance took 31 seats, the Rashtriya Janata Dal and Congress together 7, and the Janata Dal (United), fighting largely alone, 2, the single most expensive demonstration in the period that the second substrate cannot convert its assembly strength into parliamentary seats without a partner. In 2019 the reunited National Democratic Alliance won 39 of 40, the Rashtriya Janata Dal none at all, its worst parliamentary result, achieved on a vote share above 15 percent that the first-past-the-post distribution across 40 large constituencies simply annihilated. In 2024 the alliance’s 30 seats came with the parity noted earlier, 12 each for the two governing parties, while the opposition alliance’s 9 seats plus an independent at Purnea recorded the first substrate’s partial parliamentary recovery.

The national consequences run in both directions. Bihar’s contingent has repeatedly held the balance of the Union government: the United Progressive Alliance’s fall in the confidence politics of 2008, the National Democratic Alliance’s dependence on its Bihar and Andhra partners after the verdict of 2024, when the Bharatiya Janata Party fell short of a Lok Sabha majority and the Janata Dal (United)’s 12 members became indispensable to the government’s survival in New Delhi. The coalition era’s long arc taught every national party that Bihar’s contingent is won through its architecture or not at all: no national party has carried the state by direct appeal over the heads of its substrate parties since 1984, and the Congress, which once owned the state, won 3 of its 40 seats in 2024 as a junior partner inside an alliance the first substrate led. The state’s own politicians extracted the price of indispensability in each era, railway budgets and special packages in the coalition decades, the caste survey’s national reverberations after 2023, when the demand for a national caste census, carried by Bihar’s example, entered the Union government’s own agenda and was accepted in principle in April 2025. Bihar’s architecture, built from village substrates, thus reaches the Union cabinet table; a reading of the state as a two-man duel cannot even describe the transmission mechanism.

The Leaders Inside the Architecture

An architecture reading owes its critics an account of the leaders, since Bihar’s politics supplies personalities of unusual force and the binary reading is built from their biographies. The account the evidence supports is that the leaders are real, consequential and constrained: each man’s career is the biography of a substrate learning its limits. Lalu Prasad Yadav’s gifts, the rustic idiom that made the backward-caste villager hear his own speech in the chief minister’s office, the timing that read the Mandal moment a season before his rivals, built the first substrate’s consolidation between 1990 and 1995; the same gifts, turned inward as family succession and protection, built the ceiling that the elections of 2005 and 2010 measured. His incarceration after the conviction of December 2017 removed him from the 2020 campaign almost entirely, and the Rashtriya Janata Dal, led by his son Tejashwi Yadav, responded with its best seat tally in fifteen years and a campaign that traded the father’s idiom for a jobs promise addressed to the state’s unemployed young men of every caste, ten lakh government posts pledged in the manifesto’s most repeated line. The substrate survived the leader’s absence and adapted its appeal without him, which is what distinguishes a substrate from a following.

Nitish Kumar’s career is the second substrate’s biography in the same sense. The methodical constituency-building of 2005 to 2013, the Mahadalit mission, the bicycle scheme, the women’s reservation in panchayats, the prohibition pledge extracted from the women’s groups who demanded it at his public meetings, is a single continuous method: find the unorganised category, name it in policy, deliver to it, and hold it. The switches of alliance that made his national reputation for unreliability are the same method at the coalition layer: the partner of each period was the partner whose substrate least overlapped the constituency being courted at that moment, secular credentials foregrounded with one partner, national delivery foregrounded with another. Tejashwi Yadav’s emergence after 2017, Sushil Kumar Modi’s two decades as the third substrate’s Bihar face until his death in May 2024, and Ram Vilas Paswan’s long career as the Dalit Paswan community’s national broker before his death in October 2020 each follow the pattern: the man articulates the substrate, rises with it, and encounters its ceiling as a personal fate. The architecture does not deny the men. It explains why their very different talents produced such similar trajectories of rise, indispensability and limit.

Money, Machinery and the Pairing Market

The pairing market runs on machinery as well as arithmetic, and the three parties’ organisations differ as their substrates predict. The Bharatiya Janata Party possesses the deepest machinery: a booth-level committee structure fed by the Rashtriya Swayamsevak Sangh’s affiliated networks, a membership and data apparatus directed from the national organisation, and campaign resources, visible in every recent Bihar election’s hoardings, aircraft and digital saturation, that neither rival matches. The Rashtriya Janata Dal possesses the deepest society: its organisation is the Yadav community’s own associational life, its booth workers the caste’s young men in every village of its strongholds, an asset that costs little to maintain and cannot be switched off by a funding decision, joined after 2017 to a professional campaign operation under Tejashwi Yadav that modernised the party’s media and candidate research without altering its social base. The Janata Dal (United) possesses the thinnest machinery of the three, an organisation repeatedly described by its own legislators as a secretariat around its leader, dependent on the state’s administrative reach while in office and on its allies’ booth structures at election time, which is why its seat tallies swing more violently with alliance arithmetic than its vote share does. The 2020 election is the clean demonstration: the Lok Janshakti Party’s decision to contest against Janata Dal (United) candidates while remaining, at the national level, the Bharatiya Janata Party’s ally damaged the second substrate’s party in seat after seat, cutting its tally to 43 while its senior partner rose to 74, an outcome legible only in a system where machinery and pairing, not popularity alone, convert votes into governments.

Campaign finance and candidate selection follow the same grammar. Each party’s ticket distribution is a substrate census in miniature, the winnability surveys of the modern campaign era measuring what the caste arithmetic of the constituency dictates, and the rare ticket given across substrate lines is news precisely because the rule is allocation within them. The pairing market’s prices are set in the same units: a partner’s value is the seats its substrate adds in the districts where the other is weak, which is why the small parties of the state’s Dalit and Extremely Backward communities, the Hindustani Awam Morcha of Jitan Ram Manjhi, the Vikassheel Insaan Party of Mukesh Sahani, the Lok Janshakti Party of the Paswan family, command cabinet places out of proportion to their size at every government formation of the period. They are the architecture’s small change, and their price measures the big three’s need.

Policy Variations: What Each Combination Governed Differently

If the architecture were only a machine for distributing office, the coalition shifts would be politically interesting and substantively empty. The record shows the opposite: each pairing governed differently, in directions its substrates predict, and the policy documents preserved at the Bihar State Archives and in the state government’s published reports let the variations be specified rather than asserted.

The Rashtriya Janata Dal phase governed for its substrate’s protection and precedence. Its signature acts were acts of representation and defence: the implementation of reservation in state services and panchayats, the resistance to the upper-caste counter-mobilisation of the early 1990s, the arrest at Samastipur that announced the state would police the Rath Yatra, and the distribution of ministerial office across the Yadav and Muslim communities at a breadth no earlier Bihar government had attempted. Its defenders, Witsoe’s ethnography foremost among them, record what this meant in the village: the backward-caste assertion that made the police station and the block office answerable to men they had previously kept waiting at the door. The phase’s governance deficits, documented in the same decades’ crime statistics, in the fodder-scam proceedings, and in the migration of the state’s students and patients to other states’ institutions, are the counter-record, and the two records are not reconcilable by splitting the difference: they describe a government that spent its authority on one currency and declined to spend it on the other. The point for the architecture is that the choice was substrate-determined. A party whose legitimacy flows from a coalition’s dignity cannot easily discipline that coalition’s strongmen, and the caste-army war that Ashwani Kumar documents was the price extracted in the countryside for a state whose coercive apparatus had been politically disarmed in the coalition’s own villages.

The Janata Dal (United) and Bharatiya Janata Party governments after 2005 governed for the second substrate’s method: category creation and service delivery. The implementation reports preserved at the Bihar State Archives, an under-cited primary source for the period, document the sequence. The Mahadalit category of 2007, with its dedicated Vikas Mission, directed housing, sanitation and scholarship instruments to the most deprived Scheduled Caste communities as a named class. The Janani Suraksha Yojana, the national maternity-benefit scheme whose Bihar implementation the state reports track from the late 2000s, raised institutional deliveries by paying cash incentives to mothers and community health workers, an instrument aimed at the poorest households regardless of caste and therefore at the Extremely Backward and Mahadalit electorates the coalition was assembling. The Mukhyamantri Balika Cycle Yojana, begun in 2007, put a bicycle in the hands of every girl entering Class 9 in a government school and became the period’s most visible artefact, credited in the state’s own reporting with raising girls’ secondary enrolment across the coalition’s target communities. Road construction, electrification and the restoration of police functioning after 2006, the last claimed by the government as its founding achievement and conceded in part by its opponents’ own campaign rhetoric of 2010, completed a programme whose common feature is administrative: each instrument is a category, a list, a payment, a delivery, the file-driven politics of the second substrate expressed as governance.

How did prohibition change Bihar politics in 2016?

Prohibition, enacted in April 2016 by the grand alliance government, converted a women’s movement demand into the state’s most intrusive policy, banning liquor’s manufacture, sale and consumption across Bihar. It bound women voters of the Extremely Backward and Mahadalit communities to Nitish Kumar personally and gave his party a constituency crossing every substrate line.

The third shift’s government showed the same signature in reverse. Prohibition was a Janata Dal (United) instrument carried inside a Rashtriya Janata Dal-led assembly majority, and the seven resolves programme of 2015, promising piped water, toilets, electricity and student credit, extended the delivery method; while the Rashtriya Janata Dal’s ministers pressed the older politics of representation in appointments. The combination’s policy incoherence, two substrates governing at once, was the substantive ground of its 2017 collapse, beneath the immediate occasion of the corruption charges against the deputy chief minister. After 2017, the restored second pairing added the third substrate’s national instruments to the state method: the saturation delivery of central schemes, gas, housing, toilets, farm income support, administered through the Bharatiya Janata Party’s national machinery and branded nationally rather than by the state government, which shifted the credit structure inside the coalition and helps explain the 2020 seat inversion between the partners. Shift Five’s government returned to the first substrate’s currency with a modern instrument: the caste-based survey of 2022 to 2023, a counting exercise designed to re-found the reservation settlement on enumerated fact, and the attempt that followed it to raise the state’s reservation ceiling, which the Patna High Court struck down in June 2024. Six shifts, three policy grammars, each legible from the substrates in combination: that correspondence, repeated across thirty-four years, is the strongest single evidence that the architecture, and not the personalities, is doing the explanatory work.

The delivery record also carries its failures in the same documentary form, and evenhandedness requires them in the same section. Prohibition, the third shift’s proudest instrument, generated a parallel economy of smuggled and illicit liquor whose human cost fell on the poorest drinkers: hooch tragedies recurred across the prohibition years, among them the deaths at Chhapra in December 2022, where the district administration’s toll passed sixty, and the state’s enforcement filled its prisons with prohibition accused drawn overwhelmingly, as the legal-services reporting documented, from the Extremely Backward and Dalit communities the policy claimed to protect. The Patna High Court struck down the first prohibition statute in September 2016 as unconstitutional in its severity, and the government returned with a revised Act within weeks, a judicial exchange that records both the policy’s popularity with its women constituency and its administrative violence at the margins. The reservation settlement met the same judiciary with the opposite result: the enhancement of caste-based reservation to 65 percent, enacted in November 2023 on the caste survey’s authority and defended by both Mandal parties in succession, was struck down by the Patna High Court in June 2024 for want of the extraordinary justification the Supreme Court’s ceiling jurisprudence requires. The architecture reading absorbs these episodes without strain: instruments are chosen for substrates, executed at the pitch the substrate rewards, and corrected by institutions, courts and commissions, that stand outside the pairing market altogether.

The Opposition’s Craft: How the Third Party Waits

Every shift of the architecture produces not only a government but an opposition with a defined composition, and the excluded party’s conduct in opposition is the system’s least examined and most revealing layer. The pattern repeats with a fidelity that personality cannot explain. The excluded party does not fragment, does not merge into the ruling pairing and does not spend its exile on ideological repositioning; it defends its substrate’s institutions, waits for the pairing’s internal contradiction to mature, and presents itself as the available partner for the defection it expects. The Rashtriya Janata Dal in opposition from 2005 to 2015, under leaders of the house drawn from its legislative ranks, attacked the governing coalition on its law-and-order and corruption flanks while holding its Yadav and Muslim organisation intact through two assembly defeats and a parliamentary wipeout, and was rewarded in 2015 by becoming the largest party in the state. The Bharatiya Janata Party in opposition from 2022 to 2024, a brief exile, used the months to reorganise its state leadership, elevating Samrat Choudhary, a leader drawn from the Koeri cultivating castes, to the state presidency and the deputy chief ministership that followed, a substrate adjustment executed in opposition and cashed in government. The Janata Dal (United)’s only full experience of opposition in the period, the months after its 2014 parliamentary collapse, it spent not in the wilderness but in constructing the grand alliance that returned it to office within eighteen months.

The waiting craft has a technique, visible across all three parties’ opposition years. The excluded party votes in the assembly as a bloc, keeps its district organisations funded and staffed at a level its finances in opposition should not permit, cultivates the smaller parties and independent legislators whose value rises at every realignment, and maintains a standing negotiation, deniable and continuous, with the junior partner of the ruling pairing. The technique explains a feature of Bihar politics that observers often record as farce: the speed of its realignments, governments replaced within a day in July 2017 and January 2024, new councils of ministers sworn before the old one’s resignation letters had been publicly read. The speed is not improvisation. It is the visible instant of a negotiation that the architecture’s waiting parties conduct permanently, and the swearing-in dates in the government record, resignation and oath on consecutive days or the same day, are the timestamps of a market that never closes. A two-party system produces alternation; a dominant-party system produces succession crises; the three-party architecture produces the standing auction, and Bihar’s voters, who have watched six auctions conclude, price the parties accordingly, rewarding the substrate that holds and discounting the promise that depends on a pairing lasting.

Three Readings Adjudicated

The disagreement this article set out to adjudicate can be stated precisely. The binary reading, held by the standard political journalism and by the campaign narratives of both camps, holds that Bihar’s post-1990 politics is the story of Lalu Prasad Yadav and Nitish Kumar, their rivalry, their successive regimes and their personal decisions at each turning point. The Mandal-substrate reading, held in its strongest form by Jaffrelot and shared in substance by much of the scholarly literature, holds that the period is the working out of the backward-caste revolution, with the two leaders as its rival vessels and caste demography as the deep cause. The three-party-architecture reading holds that the operative unit is neither the man nor the caste bloc but the party-substrate system: three parties on three substrates, pairing and repairing under rules the substrates impose.

Against the binary reading, the decisive evidence is the behaviour of the third party and the survival of the first. A duel cannot contain a broker, yet the Bharatiya Janata Party’s partnership was the object of competition in 2013, 2015, 2017, 2022 and 2024, and the chief minister’s celebrated switches were, each time, movements between partners the binary does not cast. A duel also cannot contain a resurrection, yet the Rashtriya Janata Dal, buried by the commentators of 2005 and reduced to 22 seats in 2010, led the assembly in seats in 2015 and in votes in 2020 and 2025. The binary reading survives in journalism because personalities narrate better than structures; it fails in analysis because the events it must explain keep occurring off its stage. Sanjay Kumar’s election studies from the Centre for the Study of Developing Societies, which track Bihar’s voters survey by survey rather than leader by leader, consistently show the substrate pattern the binary misses: the Yadav and Muslim vote holding for one party across decades and leaders, the Extremely Backward vote migrating as a bloc between alliances, the upper-caste vote anchoring the third party through every configuration.

Against the Mandal-substrate reading, the decisive evidence is differentiation within the revolution. The reading explains why the upper castes lost Bihar; it does not explain why the victors divided into two parties that have fought each other for thirty years, nor why the division follows the line between the Yadav stratum and the rest of the backward classes with such fidelity, nor why the displaced order’s party grew from 39 seats in 1990 to the largest single contingent of the ruling alliance in 2020 by sheltering inside the revolution’s own governments. Jaffrelot himself supplies the materials of the correction: his Bihar chapters show the silent revolution socially stratified, its benefits concentrated in the Yadav stratum, its promise to the most backward unfulfilled by the government that spoke in their name. The architecture reading takes that stratification as its premise and adds the institutional claim Jaffrelot does not make: that once the strata acquired separate party forms, in 1994 and 1997, the party forms acquired causal force of their own, fixing the lines along which all later politics, including caste politics, would run. Mandal explains the substrates’ birth. It does not explain their subsequent behaviour, because parties, unlike castes, form governments, break alliances and contest the partner market; and Bihar’s history from 2013 to 2024 is unintelligible except as a partner market at work.

The adjudication therefore runs: the three-party-architecture reading is defended, the binary reading is rejected as a narrative convenience contradicted by the third party’s centrality and the first party’s survival, and the Mandal-substrate reading is absorbed as the architecture’s founding chapter rather than its rival. One qualification is owed. The architecture reading is a reading of the period from 1990 to 2024, and its claim is about that period’s operating pattern. Whether the pattern survives the decade opening after 2024 is an empirical question, and the strongest counter to the reading is already visible in the returns.

The survey evidence assembled by the Lokniti programme at the Centre for the Study of Developing Societies, in which Sanjay Kumar’s Bihar studies are the standard reference, lets the adjudication be checked against voters rather than manifestos. Across the post-election surveys of 2005, 2010, 2015 and 2020, the same distributions recur with a regularity that no personality variable reproduces: Yadav voters support the Rashtriya Janata Dal and its alliances at rates between two-thirds and four-fifths regardless of the alliance’s other members; Muslim voters follow the anti-Bharatiya Janata Party pairing of the cycle at comparable rates; Kurmi and Koeri voters anchor the Janata Dal (United)’s alliances while remaining available to a direct Bharatiya Janata Party appeal in parliamentary contests; and the Extremely Backward Classes, the least attached electorate in the state, move between alliances in blocs large enough to decide outcomes, which is why every pairing courts them first. Fieldworkers carrying caste-survey schedules and interview recordings through districts where the massacres of the 1990s remain within living memory treat the protection of their material as part of the method, a discipline that the account of how journalists use VaultBook to protect sources describes for the neighbouring craft: the testimony survives because the vault, not the notebook, is the record of first resort. Evidence gathered under such discipline is the kind on which substrate claims, unlike personality claims, can be founded and retested.

The Women Voters of Bihar: The Constituency Across Substrates

One constituency in Bihar votes across the substrate lines with increasing discipline, and every party in the architecture has reorganised its appeal around the fact. Women’s turnout in Bihar’s assembly elections rose across the period until it passed men’s turnout in 2010 and stayed above it, a reversal the Election Commission’s statistical reports record in each subsequent cycle, and the woman voter became the one elector each substrate’s strategists address separately from the household’s caste head. The second substrate built the instruments first: the 50 percent reservation for women in panchayat institutions in 2006, the bicycle and uniform schemes that addressed the daughter’s schooling as a state promise to her mother, and the Jeevika programme of rural livelihoods, launched in 2006 with World Bank support and expanded across the state thereafter, which organised more than a crore of rural women into self-help groups whose weekly meetings constitute the largest standing assembly of women in Bihar’s public life. Prohibition in 2016 was this constituency’s own demand, pressed on the chief minister at public meetings by Jeevika members and women’s groups, and its political ownership never left him. The other substrates answered in kind: the first substrate’s 2020 campaign promised government employment to the household’s sons in an idiom addressed to their mothers’ anxieties, and the third substrate’s national welfare saturation, gas connections and housing titles issued in women’s names, delivered the Union government’s benefits into the same hands. Before the 2025 election the ruling coalition announced a direct transfer of ten thousand rupees to women for self-employment under a state scheme, and the opposition alliance countered with a larger promised monthly transfer, an auction conducted openly for the women’s vote. A constituency that every substrate must court on terms the constituency itself sets, prohibition, physical safety, the daughter’s schooling, cash in her own account, is the closest thing Bihar’s architecture has produced to a cross-cutting citizen politics, and its disciplining effect on all three parties’ rhetoric is one of the period’s quiet transformations.

What the Architecture Cannot Explain

Evenhandedness requires the anomalies on the record, and Bihar supplies four that the architecture reading must absorb rather than dismiss. The first is the Congress survival: a party without a substrate of its own in the state since 1990 has nonetheless sat in Bihar’s governments, in the grand alliance of 2015 and the coalition of 2022, on the strength of 27 seats won in 2015 and its value as a national label and a Seemanchal and minority bridge, a reminder that legacy and alliance convenience retain a residual currency the substrate model undervalues. The second is the Lok Janshakti Party’s career: a fourth party, built on the Paswan Dalit community’s distinct identity within the Scheduled Castes, held Union cabinet office across governments of both national alliances for two decades and in 2020, contesting alone under Chirag Paswan, plausibly decided the internal hierarchy of the ruling alliance, evidence that a sufficiently concentrated minor substrate can act as a system player without being one of the three. The third anomaly is Seemanchal’s recurring escape, the five seats won by the All India Majlis-e-Ittehadul Muslimeen in 2020 on a representation claim the M-Y equation was supposed to have monopolised, and the fourth is the turnout and verdict of 2025 itself, in which the ruling alliance’s 202 seats exceeded every substrate forecast, suggesting that a national leadership’s appeal, Narendra Modi’s in this instance, can on occasion vote across the substrate lines in assembly contests as it had earlier done in parliamentary ones. None of these dissolves the architecture: the Congress survives as a tenant, the Lok Janshakti Party as a broker, Seemanchal’s escapees migrated to the first substrate’s party within two years, and the 2025 verdict still required the pairing to form its government. But they mark the model’s edges, and a reading that cannot state its edges has not earned its centre.

The Post-2024 Test: A Broker Becoming a Principal

The complication the brief for this article required to be faced is the strongest available counter to its thesis. The elections of 2024 and 2025 shifted the weights inside the architecture. In the Lok Sabha election of 2024 the National Democratic Alliance won 30 of Bihar’s 40 seats, but the Bharatiya Janata Party and the Janata Dal (United) took 12 each, parity where hierarchy had been the rule; in the assembly election of November 2025 the alliance won 202 of 243 seats, the Bharatiya Janata Party 89 and the Janata Dal (United) 85, with the Rashtriya Janata Dal reduced to 25 seats, its lowest tally since 2010. Nitish Kumar took the oath as chief minister for a tenth time on 20 November 2025, at an age and in a phase of his career that make succession inside his party an open question for the first time. On these figures, a critic may argue that the three-party architecture is dissolving into a Bharatiya Janata Party-dominant system of the kind the state studies in this pillar record elsewhere in embryo, and that the architecture reading describes a finished era: the long transition between the Mandal settlement and a national-party dominance that was always its destination. The echoes of an older rupture are audible; the 1989 verdict’s structural rupture and Mandal context shows how quickly a settled-looking order in Bihar can be re-founded by a single election and a single decision.

The seat-sharing of the 2025 contest records the reweighting in the alliance’s own hand. The Bharatiya Janata Party and the Janata Dal (United) contested 101 seats each, parity of allocation between the partners for the first time in the alliance’s history, with the remaining seats distributed among the Lok Janshakti Party formation of Chirag Paswan and the smaller Hindustani Awam Morcha and Rashtriya Lok Morcha. A generation earlier the second substrate’s party had dictated the division and the third substrate’s party had accepted the smaller share as the price of shelter; the parity formula of 2025 is the broker’s graduation certificate, signed by the partner it once sheltered under.

The counter is serious and the answer must be exact. Three facts limit it. First, indispensability: the government installed in January 2024 and renewed in November 2025 exists because the Janata Dal (United) chose the pairing, and the Bharatiya Janata Party, for all its growth, contested the 2025 election in alliance and accepted the second substrate’s leader as chief minister for a tenth term rather than risk the assembly arithmetic alone. Second, substrate persistence: the Rashtriya Janata Dal’s 25 seats of 2025 came on the largest single-party vote share in the state, about 23 percent, ahead of both governing parties, a distribution that records a substrate intact and an electoral system punishing its concentration, precisely the configuration that produced the party’s earlier returns from defeat. Third, succession asymmetry: the succession question hangs over the second substrate’s party, whose organisation is leader-bound, and not over the first or third, which possess respectively a designated heir in Tejashwi Yadav and an institutional cadre; the architecture’s likely failure point is therefore specific and observable, the Janata Dal (United)’s survival of its founder-leader, and not a general dissolution. The post-2024 shifts test the architecture, as the brief’s complication anticipated; on the evidence of the two elections, they have reweighted it without displacing it, and the verdict on displacement belongs to the assembly election of 2030 and to the succession in Patna, events this article does not predict.

Why does the third party matter in Bihar’s coalitions?

The third party matters because Bihar’s architecture makes government a pairing: with three substrates and no party able to govern alone since 2005, the excluded party sets the price of every alliance, supplies the partner to whom a dissatisfied ally can defect, and guarantees that no defeat is final and no majority is safe.

Architecture Over Biography

The claim with which this article began can be restated in its citable form. Bihar’s post-1990 politics is three-party architecture, not Lalu-Nitish binary; the substrate-distinct three parties produce policy-substantive variations through coalition shifts. The claim’s value is predictive as well as descriptive. It predicts that Bihar’s next governmental crisis will present as a pairing problem rather than a leadership contest; that the Rashtriya Janata Dal’s floor will hold near a fifth of the vote in defeat and make it the largest single party in any verdict its concentration suits; that the Janata Dal (United)’s leader, or his successor, will remain the state’s most courted politician while his substrate lasts; and that the Bharatiya Janata Party will continue to prefer brokerage to exposure until its own substrate can carry a Bihar government alone, a threshold the elections of 2024 and 2025 approached and did not cross. Read against the 1977 Janata coalition’s institutional fragility comparator, the contrast is instructive: the Janata coalition of 1977 was an alliance of parties without distinct state substrates, and it shattered within three years; the Bihar architecture is an alliance system of parties with substrates too deep to dissolve, and it has recombined for thirty-four years without breaking.

Within this pillar’s comparative design, Bihar’s case does the work the comparative state settlements framework assigned it. Tamil Nadu’s bipolar stability rests on two parties dividing a single Dravidian inheritance; West Bengal’s long arcs rest on one party’s organisational occupation of the state at a time; Uttar Pradesh’s laboratory tests whether caste parties can be displaced by a national party’s organisation. Bihar tests a fourth possibility: that a party system can be at once intensely caste-based and intensely stable in form, its instability confined to the coalition layer where the substrates meet. The Mandal politics of Bihar, reanalysed on the evidence of the Election Commission’s reports, the coalition record of six shifts and the policy documents of the governments those shifts produced, is the record of that possibility working itself out, in Patna, across a third of a century. The two men whose names the standard treatment gives the era were its most skilled operators. They were not its authors. The architecture was.

A defended claim should state what would defeat it, and the architecture reading can be falsified on three observable tests. The first is solitary government: if any one of the three parties, or a successor party carrying one substrate entire, wins a Bihar assembly majority on its own and governs a full term without a partner, the pairing premise fails. The second is substrate defection: if the Yadav electorate, the Kurmi and Extremely Backward electorates or the upper-caste electorate transfers its allegiance wholesale to a party that did not grow from its own history, in two successive elections, the substrate premise fails, since the model holds that these electorates move between pairings but not between identities. The third is displacement: if a fourth party, whether a revived Congress on an independent base, a Dalit party on the Bahujan Samaj Party’s Uttar Pradesh pattern, or a new entrant on the Seemanchal pattern generalised statewide, takes and holds a fifth of the assembly across two elections, the three-party premise fails, since the model allows brokers and tenants but not a fourth principal. None of the three tests was met in the elections of 2024 and 2025, though the second came under its heaviest strain in the second substrate’s shrinking seat conversion and the third was approached, at district scale only, in Seemanchal in 2020. The tests are stated so that the reading can lose. A reading that can lose, and has not, is worth more than a narrative that cannot.

Frequently Asked Questions

Q: What is the RJD?

The Rashtriya Janata Dal is Bihar’s party of the Yadav and Muslim coalition, constituted at New Delhi on 5 July 1997 when Lalu Prasad Yadav separated his following from the Janata Dal after the fodder-scam chargesheet named him. The party governed Bihar from its founding until March 2005, first as the vehicle of Lalu Prasad Yadav and then of Rabri Devi, and has since been the state’s principal opposition or alliance leader in alternation. Its electoral signature is a durable floor: a vote share that has stayed above a fifth of the state’s total in nearly every assembly contest, delivered by the Yadav community’s organisation and the Muslim electorate’s allegiance, which together survive defeats, the founder’s imprisonment and changes of leadership to his son Tejashwi Yadav.

Q: Who is Lalu Prasad Yadav?

Lalu Prasad Yadav is the founder of the Rashtriya Janata Dal and the central figure of Bihar’s Mandal consolidation. A product of the Jayaprakash Narayan movement of 1974, he was elected to the Lok Sabha from Chhapra in 1977, became chief minister of Bihar on 10 March 1990 after the Janata Dal’s victory, implemented the Mandal settlement in the state, ordered the arrest of Lal Krishna Advani at Samastipur in October 1990, and held office until the fodder-scam chargesheet forced his resignation on 25 July 1997, installing Rabri Devi in his place. Convicted in the fodder cases from 2013 onward, he remains his party’s founding authority, while its public leadership passed to his son Tejashwi Yadav after 2017.

Q: What is the JDU and who leads it?

The Janata Dal (United) is Bihar’s party of the pan-backward coalition, anchored in the Kurmi caste cluster and extended to the Koeri, Vaishya, Extremely Backward and Mahadalit constituencies. It took its consolidated form in October 2003, when the Samata Party founded by George Fernandes and Nitish Kumar merged into the Janata Dal faction led by Sharad Yadav. Nitish Kumar, a Kurmi leader from Nalanda district and a former Union minister, has been its Bihar leader and the state’s chief minister, with interruptions of months, from November 2005 onward, governing in coalition with the Bharatiya Janata Party or the Rashtriya Janata Dal in alternation. The party’s method is administrative constituency-building: categories created in policy, from the Mahadalit classification of 2007 onward, converted into electorates.

Q: How is Bihar’s politics organised?

Bihar’s politics is organised as a three-party architecture. The Rashtriya Janata Dal rests on a Yadav and Muslim substrate, the Janata Dal (United) on a pan-backward substrate anchored in the Kurmi cluster and extended to the Extremely Backward Classes and Mahadalit categories, and the Bharatiya Janata Party on an upper-caste substrate widened after 2014. No party has governed alone since 2005, so the state’s government is always a pairing drawn from the three, and the pairings have rotated through six configurations between 1990 and 2024: Rashtriya Janata Dal rule, Janata Dal (United) with Bharatiya Janata Party, Rashtriya Janata Dal with Janata Dal (United), and their repetitions. Smaller parties representing concentrated Dalit and Extremely Backward constituencies trade inside the same market as brokers.

Q: What are the Mahadalit categories?

The Mahadalit category is a Bihar state classification created in 2007 on the recommendation of the Bihar State Mahadalit Commission, grouping the most deprived communities within the state’s Scheduled Castes for targeted welfare delivery. The classification initially covered eighteen of the twenty-two Scheduled Caste communities, setting aside the relatively better-placed among them, and the state administered its instruments, housing, sanitation, scholarships and land and livelihood support, through a dedicated Bihar Mahadalit Vikas Mission. Politically, the category converted the poorest Dalit communities into a named constituency of the Janata Dal (United) governments that created it, an example of the administrative category-making by which Bihar’s second party-substrate was assembled, and it was later extended in stages toward the full Scheduled Caste list.

Q: Why does Nitish Kumar switch alliances?

Nitish Kumar’s changes of alliance, in June 2013, July 2017, August 2022 and January 2024, follow the logic of Bihar’s three-party architecture rather than a single personal motive. His Janata Dal (United) rests on a pan-backward substrate that overlaps neither with the Rashtriya Janata Dal’s Yadav and Muslim base nor with the Bharatiya Janata Party’s upper-caste base, which makes his party the one partner either rival can accept and the one leader who can pair with both. Each switch exchanged a pairing whose internal charge had risen, a national leadership dispute in 2013, a deputy’s corruption charges in 2017, a junior partner’s growing dominance in 2022, an opposition alliance’s arithmetic in 2024, for the other available pairing, leaving his substrate and his office intact.

Q: What is the post-2024 Bihar political situation?

In January 2024 Nitish Kumar resigned from the grand alliance government, formed a government with the Bharatiya Janata Party the same day, and took office as chief minister for a ninth time. The alliance then won 30 of Bihar’s 40 Lok Sabha seats in the general election of 2024, the two governing parties taking 12 each, and in the assembly election of November 2025 it won 202 of 243 seats, the Bharatiya Janata Party taking 89 and the Janata Dal (United) 85, with the Rashtriya Janata Dal reduced to 25 seats on the largest single-party vote share. Nitish Kumar was sworn in for a tenth term on 20 November 2025, and the open questions of the configuration are his party’s succession and the larger partner’s patience.

Q: What was the fodder scam and why did Lalu Prasad Yadav resign as chief minister in 1997?

The fodder scam was the fraudulent withdrawal of roughly 950 crore rupees from Bihar’s animal husbandry department treasuries, drawn on forged bills for fodder and supplies across the 1980s and 1990s and exposed in January 1996 through the Chaibasa treasury. The Patna High Court ordered a Central Bureau of Investigation inquiry in March 1996, and the Bureau’s chargesheet of June 1997 named the serving chief minister, Lalu Prasad Yadav, among the accused. Facing arrest, he resigned on 25 July 1997 and his wife Rabri Devi was sworn in the same day. A special court at Ranchi convicted him in the first case in September 2013, with further convictions in 2017 and 2018; his defence maintained that he had ordered inquiry into the withdrawals and that the prosecution was a conspiracy against a backward-caste leader.

Q: Who is Rabri Devi and how long did she lead Bihar’s government?

Rabri Devi is the Rashtriya Janata Dal leader who served as chief minister of Bihar from 25 July 1997 to March 2005, the longest continuous tenure of the period and the first by a woman in the state’s history. Installed on the day of her husband Lalu Prasad Yadav’s resignation over the fodder-scam chargesheet, she won the assembly election of 2000 at the head of the party and governed through the state’s bifurcation, a brief spell of President’s rule in 1999 and the hung verdict of February 2005 that ended her tenure. Her governments are defended by her party as the continuation of the Mandal settlement under siege and indicted by opponents as proxy rule; the documentary record shows a ministry that held its coalition’s allegiance through eight years its critics expected to last months.

Q: Who is Tejashwi Yadav?

Tejashwi Yadav, born in 1989, is the younger son of Lalu Prasad Yadav and Rabri Devi and the Rashtriya Janata Dal’s leader in the Bihar assembly. He served as deputy chief minister in the grand alliance government of 2015 to 2017 and again in the coalition of 2022 to 2024, and led his party’s campaign in the assembly election of 2020, when the Rashtriya Janata Dal emerged as the single largest party with 75 seats on a campaign centred on government employment for the state’s young men. His leadership marks the party’s generational transfer: the founder’s idiom of caste dignity supplemented by a jobs programme addressed across caste lines, while the organisation and the Yadav and Muslim substrate beneath it remain the inheritance his father built.

Q: What is the mahagathbandhan in Bihar politics?

The mahagathbandhan, or grand alliance, is the name Bihar gives to the combination formed against the Bharatiya Janata Party’s alliance, first assembled for the assembly election of 2015, when the Rashtriya Janata Dal, the Janata Dal (United) and the Congress joined to win 178 of 243 seats. The combination broke in July 2017 when the Janata Dal (United) crossed to the Bharatiya Janata Party, was reassembled without it for the elections of 2019 and 2020 with the Left parties and smaller allies inside, received the Janata Dal (United) back in August 2022 to form a government, and lost it again in January 2024. The name therefore denotes not a fixed party bloc but the anti-Bharatiya Janata Party pairing of the cycle, whose membership is set by the three-party architecture’s rotations.

Q: What are the Extremely Backward Classes in Bihar’s politics?

The Extremely Backward Classes, called the Ati Pichhda in the state’s political vocabulary, are the more backward stratum of Bihar’s Other Backward Classes: more than a hundred small castes of artisans, boatmen, salt-makers, oil-pressers and service providers, including the Nonia, Mallah, Teli and Nai communities, whom Karpoori Thakur’s reservation formula of 1978 first separated administratively from the larger backward castes. The caste-based survey published in October 2023 counted them at about 36 percent of the state’s population, the largest single bloc in Bihar’s demography. Because no single caste among them can anchor a party, they are the state’s decisive floating electorate, addressed as a bloc first by the Janata Dal (United)’s category politics and courted by every pairing at each election.

Q: Who was Karpoori Thakur and what was his reservation formula?

Karpoori Thakur, a leader of the Nai barber community, was the socialist chief minister of Bihar from December 1970 to June 1971 and from June 1977 to April 1979, and the state’s pioneer of reservation politics. His second government implemented in November 1978 the recommendations of the Mungeri Lal Commission in the formula that bears his name: 26 percent of state government posts reserved, divided as 12 percent for the backward classes, 8 percent for the most backward among them, 3 percent for women and 3 percent for the poor of the castes outside the scheme. The formula provoked an upper-caste agitation that helped end his government within months, established the backward and most backward distinction on which Bihar’s later category politics rests, and was recognised nationally when the Bharat Ratna was conferred on him in 2024.

Q: What was the Ranvir Sena and why did caste armies form in Bihar?

The Ranvir Sena was a private army of Bhumihar landlords, raised in 1994 under Brahmeshwar Singh in the central Bihar districts to fight the Naxalite squads that organised the rural poor, many of them Dalit labourers demanding wages and dignity in the fields. Caste armies formed because the collapse of the old single-party order left the Bihar countryside’s contests over land, wages and honour without a state arbiter either side trusted: landlords armed through bodies such as the Ranvir Sena, and the rural poor through the armed squads of the Maoist parties. The war’s massacres, Bathani Tola in July 1996 with 21 killed and Laxmanpur Bathe in December 1997 with 58 killed, are documented in Ashwani Kumar’s Community Warriors of 2008, the standard scholarly account of the period’s violence.

Q: When did Jharkhand separate from Bihar and what changed for the state?

Jharkhand separated from Bihar on 15 November 2000 under the Bihar Reorganisation Act, taking the state’s southern plateau districts, its mineral belt, its industrial towns of Jamshedpur, Bokaro and Dhanbad and eighteen of its fifty-four Lok Sabha seats into the new state. The separation had been demanded for decades by the Jharkhand movement on grounds of tribal identity and the region’s neglect by Patna. For the residuary Bihar the change was structural: the state lost the greater part of its mining revenue and industry while retaining its population density and its agrarian economy, its assembly shrank from 324 to 243 seats, and its politics, freed of the plateau’s distinct tribal questions, settled more completely into the caste architecture of the plains that this article describes.

Q: Who is Jitan Ram Manjhi and why did his chief ministership end in 2015?

Jitan Ram Manjhi, a leader of the Musahar community among the Mahadalit categories, became chief minister of Bihar in May 2014 when Nitish Kumar resigned after the Janata Dal (United)’s collapse in the Lok Sabha election. His appointment was read as the second substrate’s outreach to the poorest Dalit community in the state. Within months Manjhi asserted independence from the man who had installed him, declined to vacate the office when the party demanded his return, and was expelled from the Janata Dal (United) in February 2015; facing a trust vote he could not win, he resigned on 20 February 2015, and Nitish Kumar resumed office two days later. Manjhi then constituted his own party, the Hindustani Awam Morcha, which has traded in Bihar’s pairing market since.

Q: What were the main results of the 2020 Bihar assembly election?

The assembly election of October and November 2020, held in three phases during the pandemic year, returned the National Democratic Alliance with 125 of 243 seats: the Bharatiya Janata Party won 74, becoming the larger partner in the state government for the first time, the Janata Dal (United) fell to 43 under the pressure of the Lok Janshakti Party’s separate contest against its candidates, and the alliance’s smaller partners took the remainder. The grand alliance won 110 seats, the Rashtriya Janata Dal emerging as the single largest party with 75 on Tejashwi Yadav’s employment campaign, the Congress 19 and the Left parties 16. Nitish Kumar took office as chief minister on 16 November 2020 at the head of a coalition in which his party was no longer the senior partner.

Q: What policies marked the first Nitish Kumar government after 2005?

The government installed on 24 November 2005 under Nitish Kumar, in coalition with the Bharatiya Janata Party, defined itself against the preceding fifteen years by administrative restoration. Its documented programme included the reactivation of policing and fast-track courts that its supporters credit with ending the kidnapping economy of the towns, a road and bridge construction drive that connected the district headquarters, the Mukhyamantri Balika Cycle Yojana from 2007, which gave a bicycle to every girl entering Class 9 in a government school, the creation of the Mahadalit category in 2007 with its dedicated development mission, the 50 percent reservation for women in panchayat institutions enacted in 2006, and the expansion of the Jeevika self-help group programme among rural women. The Election Commission’s record of its re-election in 2010 with 206 seats measures the programme’s electoral reception.

Q: Why did the JDU leave the BJP-led alliance in 2013?

The Janata Dal (United) ended its seventeen-year alliance with the Bharatiya Janata Party on 16 June 2013, days after the Bharatiya Janata Party placed Narendra Modi at the head of its national election campaign committee at its Goa conclave. Nitish Kumar’s stated reasoning, given at the time and repeated since, was that the alliance’s terms required a national leader acceptable across the communities of his Bihar coalition, and that the elevation of a figure associated in his Muslim and Extremely Backward electorate’s mind with the Gujarat violence of 2002 broke those terms. The Bharatiya Janata Party’s Bihar ministers were dismissed, the government survived on outside support, and the decision’s cost arrived in the Lok Sabha election of 2014, where the Janata Dal (United), contesting largely alone, won two of the state’s forty seats.

Q: What is the special category status demand in Bihar politics?

The special category status demand is Bihar’s standing claim, maintained by every government of the state since the category’s fiscal privileges were distributed among the hill and north-eastern states, that Bihar’s poverty, population density, flood exposure and revenue weakness entitle it to the preferential central assistance, higher grant shares and tax concessions the category carries. Nitish Kumar carried the demand to a public campaign with his Adhikar Yatra of 2012 and repeated it inside both national alliances he subsequently joined; assembly resolutions supporting it have passed with all-party agreement, a unanimity found on no other question in the state’s politics. Successive Union governments have declined the status while conceding packages in its place, and the demand’s persistence across every pairing in Patna marks the outer limit of the architecture’s internal divisions.