| 1 Oct 1963 |
the Federal Republic of Nigeria is established in accordance with the Constitution of the Federation, adopted by the Parliament of the Federation of Nigeria (House of Representatives on 18 Sep 1963; Senate on 19 Sep 1963; assented to on 19 Sep 1963), effective on 1 Oct 1963 as provided by Art. 166(1) (Nigeria Official Gazette, No. 71, Extra, 19 Sep 1963, Supplement A, pp. A91-A171) [1] |
| 1 Oct 1963 - 24 May 1966 |
Federal Republic of Nigeria |
| 24 May 1966 |
Nigeria ceases to be a Federation and becomes a Republic by the name of the Republic of Nigeria on 24 May 1966, the date appointed by a decree of the Federal Military Government issued on 24 May 1966 (Nigeria Official Gazette, No. 51, Extra, 24 May 1966, Supplement A, pp. A153-A159) [2] |
| 24 May 1966 - 31 Aug 1966 |
Republic of Nigeria |
| 1 Sep 1966 |
Nigeria forms a Federation as defined by the Constitution of the Federation on 1 Sep 1966, the date appointed by a decree of the National Military Government issued on 31 Aug 1966 (Nigeria Official Gazette, No. 85, Extra, 1 Sep 1966, Supplement A, pp. A231-A236) [3] |
| 1 Sep 1966 - |
Federal Republic of Nigeria |
