Tanzania: Polity Style: 1964-2026

26 Apr 1964	Tanganyika and Zanzibar form the United Republic of Tanganyika and Zanzibar on 26 Apr 1964, the date appointed by an act passed by the National Assembly of Tanganyika and assented to on 25 Apr 1964 and by a law made by the Revolutionary Council of the People's Republic of Zanzibar on 25 Apr 1964, ratifying the Articles of Union signed at Zanzibar on 22 Apr 1964 (Tanganyika Gazette, No. 29, 26 Apr 1964, Supplement No. 1, pp. 163-169; Tanzania Gazette, No. 31, 1 May 1964, Supplement, pp. 401-407) [1][2]
26 Apr 1964 - 11 Dec 1964	Jamhuri ya Muungano wa Tanganyika na Zanzibar :: United Republic of Tanganyika and Zanzibar
29 Oct 1964	a decision of the Cabinet to change the name to the United Republic of Tanzania is publicly announced
11 Dec 1964	the name of the state is changed to the United Republic of Tanzania in accordance with an act passed by the National Assembly on 3 Dec 1964, assented to on 10 Dec 1964, effective on publication in the Tanzania Gazette on 11 Dec 1964 (Tanzania Gazette, No. 73, 11 Dec 1964, Supplement No. 1, pp. 371-372)
11 Dec 1964 -	Jamhuri ya Muungano wa Tanzania :: United Republic of Tanzania

Full title: An Act to ratify the Articles of Union between the Republic of Tanganyika and the People's Republic of Zanzibar, to provide for the government of the United Republic and of Zanzibar, to make provision for the Modification and Amendment of the Constitution and Laws of Tanganyika for the purpose of giving effect to the Union and the said Articles, and for matters connected therewith and incidental thereto (may be cited as the Union of Tanganyika and Zanzibar Act, 1964).
Full title: A law to ratify the Articles of Union between the People's Republic of Zanzibar and the Republic of Tanganyika, to provide for the government of the United Republic of Zanzibar, to make provision for the modification and amendment of the law of Zanzibar for the purpose of giving effect to the union, and for matters connected therewith and incidental thereto (may be cited as the Union of Zanzibar and Tanganyika Law, 1964).
Full title: An Act to change the name of the United Republic (may be cited as the United Republic (Declaration of Name) Act, 1964). Art. 2.2 provided for validity of the acts issued between 29 Oct 1964 and 11 Dec 1964 under the name Jamhuri ya Muungano wa Tanzania :: United Republic of Tanzania (in official but non-statutory use).