In 1960, Nigeria achieved independence from the British Empire. Following independence, Nigeria was divided primarily along ethnic lines and in January 1966, members of the Igbo ethnic group began a military rebellion, intending to secede from Nigeria and form an independent sovereign state as the Republic of Biafra.
The official secession was proclaimed in May 1967, but was followed almost immediately by an invasion. The Nigerian army reclaimed its lost territory inch by blood soaked inch, and finally, a ceasefire was reached in January 12, 1970. Over one million people had died in the war.
By Eric Gaba (Sting – fr:Sting) – Own work
Background map: NGDC GSHHS and WDBII data
Biafra independent state borders reference maps: UN, Matthew White, Otvaga2004, Travel-Image (originally a CIA map ?), Biafraland and MSN Encarta, CC BY-SA 3.0, Link
As mentioned in: