- Aba Bloody Tuesday (1999–2000) — post-election violenceElection Crisis Pattern
Abia State · Crisis deep dive
Fourth Republic — Obasanjo · Yar'Adua · Jonathan (1999–2015)
Methodology
Tier 1 · primary
Courts. Gazettes. National archives.
Tier 2 · corroborating
OCCRP. HRW. BudgIT. TheCable.
Tier 4 · tertiary, flagged
Wikipedia only where primary is pending. Always labelled.