The laws of the Federation of Nigeria were revised and consolidated pursuant to The Revised Edition (Laws of the Federation of Nigeria) Decree 1990. The laws in force as of the 31st day of January 1990 - that is to say, the several enactments and subsidiary legislation - were subsequently published in 471 Chapter bound in 24 Volumes. These laws are styled "Acts".
The work was done by the Law Revision Committee led by the late Honourable Mr. Justice George Baptist Ayodola Coker, Retired Justice of the Supreme Court of Nigeria.
The Constitution of Nigeria is the supreme law of the Federal Republic of Nigeria.
Nigeria has had a series of constitutions. The current constitution was enacted on 29 May 1999, inaugurating the Nigerian Fourth Republic.
Colonial era (1914–1960)
Nigeria's first constitutions were enacted by order in council during the colonial era, when the country was administered as a Crown Colony. The constitutions enacted during this period were those of 1913 (which came into effect on 1 January 1914), 1922, 1946, 1951 and 1954.
Independence constitution (1960)
Nigeria's first constitution as a sovereign state was enacted by a British order in council so as to come into force immediately upon independence, on 1 October 1960. Under this constitution Nigeria retained Queen Elizabeth II as titular head of state.
1963 constitution (First Republic)
Independent Nigeria's second constitution established the country as a federal republic. It came into force on 1 October 1963 (Nigeria's third anniversary as an independent nation). The 1963 constitution, which was based on the Westminster system, continued in operation until a military coup in 1966 overthrew Nigeria's democratic institutions.
1979 constitution (Second Republic)
The 1979 constitution, which brought in the Second Republic, abandoned the Westminster system in favour of an American-style presidential system, with a direct election,directly-elected. To avoid the pitfalls of the First Republic, the constitution mandated that political parties and [[Federal Executive Council (Nigeria cabinet] positions reflect the "federal character" of the nation: political parties were required to be registered in at least two-thirds of the States of Nigeria or states, and each state had to have at least one member of the cabinet from it.
1993 constitution (Third Republic)
The 1993 constitution was intended to see the return of democratic rule to Nigeria with the establishment of a Third Republic, but was never fully implemented, and the military resumed power until 1999
1999 constitution (Fourth Republic)
The 1999 constitution restored democratic rule to Nigeria, and remains in force today. In January 2011, two amendments of the 1999 constitution were signed by President Goodluck Jonathan, the first modifications since the document came into use in 1999.