Zanzibar: Polity Style: 1856-1964

before 2 Nov 1856	Zanzibar forms part of the dominions of the Āl Bū Saʿīd house (Oman)
2 Nov 1856	a member of the house of Āl Bū Saʿīd, Mājid bin Saʿīd, proclaims himself sovereign ruler of Zanzibar
2 Nov 1856 - 9 Dec 1963	Zanjabār (زنجبار) :: Zanzibar
2 Apr 1861	a settlement decided by the Viceroy and Governor-General of India, historically known as the Canning Award, provides for the establishment of a sovereign state in Zanzibar (accepted by the Sultan of Muscat on 15 May 1861 and by the Sultan of Zanzibar on 25 Jun 1861) (British and Foreign State Papers, 56:1399-1400; Aitchison, 7:197-199) [1]
7 Nov 1890	the protectorate of the United Kingdom over Zanzibar is formally proclaimed on 7 Nov 1890, in accordance with an agreement signed by Her Majesty's Agent and Consul-General and the Sultan of Zanzibar at Zanzibar on 14 Jun 1890 (British and Foreign State Papers, 82:653-654); Times of India, No. 266, 8 Nov 1890, p. 5)
10 Dec 1963	Zanzibar ceases to be a protectorate and becomes an independent state on 10 Dec 1963, the date appointed by an act passed by the Parliament of the United Kingdom (House of Commons on 26 Nov 1963; House of Lords on 3 Dec 1963, received Royal Assent on 3 Dec 1963) (Public General Acts, 1963, pp. 1397-1405)
10 Dec 1963	the Constitution of the State of Zanzibar, passed by the Constituent Assembly of Zanzibar on 27 Nov 1963, comes into operation on 10 Dec 1963, the date appointed by Art. 138 of the Constitution (Zanzibar Gazette, No. 4320, Extra, 5 Dec 1963, Legal Supplement, Part I, pp. 1-72)
10 Dec 1963 - 12 Jan 1964	State of Zanzibar
12 Jan 1964	Zanzibar is proclaimed a republic as a result of the military revolt (Afrika Kwetu, 26 Jan 1964, p. 1)
12 Jan 1964 - 25 Apr 1964	Jamhuri ya Watu wa Unguja na Pemba \| People's Republic of Zanzibar (Unguja) and Pemba [2]
26 Apr 1964	the People's Republic of Zanzibar forms part of 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) [3][4]

Full title (English): Award of the Governor-General of India for the Settlement of differences between the Sultan of Muscat and the Sultan of Zanzibar (appears in the form of two identical letters to the rulers of Muscat and Zanzibar dated 2 Apr 1861,
Unguja, commonly referred to as Zanzibar Island, forms part of the Zanzibar archipelago.
Full title (English): 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 (English): 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).