The violence against the Igbo increasd their desire for autonomy in May 1967, and declared an independent state called the Republic of Biafra under the leadership of Lt. Colonel Ojukwu in line with the wishes of the people.
A 30 months civil war ended by the defeat of south east nigeria, which changed head of state twice as many officers staged a bloodless coup against Gowon and enthroned Murtala Mohammad;
In the meantime oil prices were increased and Nigeria joined the OPEC. billion of ollars generated by production in the oil-rich Niger delta. increase of earning of foreign money also helped in the increase of corruption. general Mohammedwas assassinated on Feb. 1976, in an abortive coup.His chief of staff Lt. Gen.Obasanju became the head of state.Reorganisation of states took place and in 1996 there were 36 in number.
A cosnituent Assembly was elected in 1977.