One of the main features of the Republican Constitution adopted by Nigeria in 1963 was that the

One of the main features of the Republican Constitution adopted by Nigeria in 1963 was that the President became the Head of State. Prior to the adoption of the 1963 constitution, Nigeria was operating as a parliamentary system of government, and the Governor-General, who was appointed by the Queen of England, served as the ceremonial head of state. However, with the adoption of the Republican Constitution in 1963, Nigeria became a republic and the President became the Head of State with executive powers. The Prime Minister, on the other hand, became the Head of Government.