On 1 October 1963 Nigeria became a Republic. The Queen ceased to be Head of State; Nnamdi Azikiwe, the Governor-General, became the ceremonial first President of Nigeria. Tafawa Balewa continued as Executive Prime Minister.
The Mid-Western Region was carved out of the Western Region in August 1963 by a referendum — the first and only new region created under the parliamentary system, and the result of a motion first tabled in the House by M.S. Sowole. It marked the first attempt to use the federation's own machinery to redress minority grievances — a pattern that would be revived under the military in 1967, 1976, 1987, 1991 and 1996.