The United Republic of Tanzania comprises the Mainland Tanzania (Tanganyika) and Zanzibar. The Mainland attained its independence from Britain under the leadership of the Tanganyika African National Union (TANU) on 9th December, 1961. In Zanzibar the Afro-Shirazi Party (ASP) staged a revolution on 12th January, 1964 ousting an Arab-dominated coalition after an election late 1963. A Union between Zanzibar and Tanganyika came into being on 26th April 1964. By the operation of law, TANU was the sole political party on the Mainland from 1965 while ASP remained the only political organization in Zanzibar. On the 5th February, 1977 TANU and ASP merged to form Chama cha Mapinduzi (CCM) and the two governments came under a single political party, CCM. Constitutionally there have always been two governments: the Union Government and the Revolutionary Government of Zanzibar. The Government of the United Republic has jurisdiction over all Union matters throughout the United Republic and over Non-Union Matters on the Mainland. The Revolutionary Government of Zanzibar (RGoZ) has jurisdiction over all Non-Union matters in Zanzibar.