The Fourth Republic began on 29 May 1999 with the swearing-in of Chief Olusegun Obasanjo, a Yoruba former military Head of State adopted by the People's Democratic Party as the consensus civilian candidate of a Northern political establishment that had spent the previous six years annulling, jailing and outlasting MKO Abiola's mandate. Obasanjo's selection was the founding bargain of the Fourth Republic: a Southern figurehead acceptable to the Northern political class, governing under a constitution drafted by the outgoing military government, on the understanding that the presidency would rotate between North and South across eight-year cycles.
This informal arrangement — the PDP zoning formula — was adopted by resolution of the PDP National Convention at Jos in February 1999. It allocated the presidency to the South for two terms (1999–2007), then to the North for two terms (2007–2015), then to the South again (2015–2023), and so on. The formula was never written into the constitution. It was binding only on PDP nominations. It was honoured by Obasanjo's two terms; broken by the death of Umaru Musa Yar'Adua in office on 5 May 2010 and the constitutional ascension of Goodluck Jonathan, a Southern Vice-President, to complete the Northern term; contested by the PDP North in 2011 when Jonathan ran for and won his own term; vindicated by the APC's nomination of Muhammadu Buhari in 2015 (returning the presidency to the North); and re-affirmed by the APC's nomination of Bola Ahmed Tinubu in 2023 (returning it to the South after Buhari's two terms).
## Where the perpetual-power logic shows up in the Fourth Republic
Election timing. The 2011 PDP presidential primary at Eagle Square pitted Jonathan against the former Vice-President Atiku Abubakar (Northern) as the Northern political establishment's consensus candidate. The Northern Political Leaders Forum's communiqué (the Adamu Ciroma Committee) of November 2010 demanded that the PDP North field a single candidate against Jonathan on the ground that the zoning formula required the presidency to remain in the North until 2015. The committee's intervention failed; Jonathan won the primary 2,736 to 805. The 2011 general election was won by Jonathan with 22.4 million votes against Buhari's 12.2 million. The post-election riots in the North — Kaduna, Kano, Gombe, Bauchi, Katsina, Niger, Adamawa — produced over 800 deaths in three days and were the most violent post-election episode of the Fourth Republic. The Sheikh Lemu Commission of Inquiry attributed the violence in significant part to the perception that the zoning formula had been violated.
Cabinet composition. The Federal Character Principle (Section 14(3)) requires that federal appointments reflect the federal character of the country. The principle has, across every Fourth Republic administration, been honoured at the level of ministerial appointments (one minister per state, broadly). It has been less consistently honoured at the level of security service headships — the so-called 'security architecture' (Chief of Defence Staff, Chief of Army Staff, Inspector-General of Police, Director-General SSS, NSA, Comptroller-General Immigration, Comptroller-General Customs). The Premium Times audit of security-service appointments under the Buhari administration in October 2019 reported that of the seventeen heads of the principal security and intelligence agencies, fifteen were Muslims from the North. The corresponding figure under the Tinubu administration as at January 2024 was a more even distribution but the senior military command remained predominantly Northern.
Revenue-allocation politics. The principal Fourth Republic case on revenue allocation — *Attorney-General of the Federation v. Attorney-General of Abia State & 35 Others* (2002) 6 NWLR 542 — was a challenge by littoral states to the federal practice of treating offshore oil revenue as undeserved of the 13 per cent derivation. The Supreme Court ruled for the federation on the substantive question, holding that the derivation principle did not extend to the continental shelf beyond the low-water mark. The decision excluded approximately 40 per cent of federal oil revenue from the derivation calculation. The political settlement that followed — the Onshore-Offshore Dichotomy (Abolition) Act 2004 — restored derivation on offshore production up to the 200-metre isobath but not beyond. The Northern political position throughout the negotiation was that the 13-per-cent derivation was already generous and should not be expanded; the eventual compromise reflected that position.
Constitutional review. The most ambitious Fourth Republic constitutional review — the 2014 National Conference under President Jonathan — produced 633 recommendations including the creation of six geopolitical zones as constitutional units, the reduction of the federal exclusive legislative list, the devolution of policing power to states, and the revision of the revenue allocation formula. The Conference's recommendations were shelved by the Buhari administration in 2015. The Tinubu administration's State Police Bill (the 2026 Sixth Alteration) is the first substantive Fourth Republic devolution of federal power, and is narrowly confined to policing. The broader restructuring agenda — the renegotiation of the Lyttleton settlement — remains unaddressed.
## The 2023 transition and the Tinubu presidency
The 2023 general election returned the presidency to the South-West under the APC's Bola Ahmed Tinubu. The election was contested by Atiku Abubakar (Northern, PDP) and Peter Obi (South-Eastern, Labour Party). Tinubu won with 36.6 per cent of the valid votes — the lowest winning percentage in the Fourth Republic — against Atiku's 29.1 per cent and Obi's 25.4 per cent. The election was the first in the Fourth Republic in which a major-party Northern candidate lost the North conclusively (Atiku won 12 Northern states; Obi won 1; Tinubu won the South-West and several Middle Belt and South-South states; the South-East voted overwhelmingly for Obi).
The Tinubu presidency therefore inherited the federal architecture of the Fourth Republic with one significant difference: the Northern political consensus that had delivered every Fourth Republic president from 1999 to 2023 had fractured. The Lyttleton settlement's electoral expression — a Northern bloc vote determining the federal outcome — no longer operates as predictably as it did in 1999, 2003, 2007, 2011, 2015 and 2019. Whether the structural inheritance survives the electoral fragmentation is the question the next presidential cycle will answer.
What sixty-four years of the Republic have not done is develop the North. That is the subject of Act V.
Figure 1
North–South share of the population, every official census 1952–2006
Every census since 1952 has returned a Northern majority. The 1963 number anchored Northern parliamentary dominance; the 2006 number anchors the present revenue formula.
Figure 2
Multidimensional Poverty headcount by zone, 2022
The paradox of perpetual power. Four decades of Northern political control coincide with the highest multidimensional poverty rates in the federation.
Figure 3
Adult literacy by zone, 2018 (ages 15+)
The same structural pattern in human capital. The three Northern zones cluster below 60%; the three Southern zones above 78%.