History of Tanzaia

The United Republic of Tanzania was formed out of the union of two sovereign states namely Tanganyika and Zanzibar. Tanganyika became a sovereign state on 9^th December, 1961 and became a Republic the following year.  Zanzibar became independent on 10^th December, 1963 and the People's Republic of Zanzibar was established after the revolution of 12^th January, 1964. The two sovereign republics formed the United Republic of Tanzania on 26^th April, 1964. However, the Government of the United Republic of Tanzania is a unitary republic consisting of the Union Government and the Zanzibar Revolutionary Government.

Source: http://www.tanzania.go.tz/profile1f.html