The Unification Decree (Decree No. 34) of 1966, which abolished the federal structure and created a unitary government in Nigeria, was promulgated by

Decree No. 34 of 1966 was promulgated by General Johnson Aguiyi-Ironsi, who sought to unify Nigeria's administrative structure by abolishing the regions and the federal system. This decree was deeply resented by Northerners, who feared Southern domination, and contributed significantly to the counter-coup of July 1966 that ended Ironsi's regime.