- 1927 Warri Olu controversy — colonial restoration of the Olu of Itsekiri title (downgraded since 1848) sparks the first round of Itsekiri-Urhobo enmity over Warri Township ownership.
- 1934 Sapele timber strike — UAC sawmill workers' walkout against piece-rate cuts.
- 1949 Burutu wharf riots — UAC marine workers' strike, four killed by police.
- 1952 Itsekiri-Urhobo Warri land dispute — Royal Commission of Inquiry under Hon. W.E. Hunt sits in Warri; recommends the contested "Warri" name be retained but ownership unresolved.
Delta State · Crisis deep dive
Colonial era — taxes, Warri intercommunal disputes (1914–1960)
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.