- 1967–1970 — Biafran War. The central Ijaw (Bayelsa today) sit on the federal side after Boro's intervention; the eastern Ijaw (Kalabari, Bonny) are caught between the lines. Coastal raids and naval blockade devastate Brass and Nembe trade for three years.
- 1970s gas-flare era — Shell-BP and Agip begin continuous gas flaring at Oloibiri, Ogbia and Nembe; flares burn 24/7 for decades. World Bank later ranks Nigeria the second-largest gas flarer in the world after Russia.
Bayelsa State · Crisis deep dive
Civil War & oil-boom military (1967–1979)
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.