Mainland Tanzania (formerly Tanganyika) received independence in December 1961, while Zanzibar gained her independence in January 1964, through a revolution. The two countries joined together to form the United Republic of Tanzania in April 1964. Until July 1992, Tanzania was a one-party state. Following a Presidential Commission, the country has started a multi-party political system. It has held successful general elections in 1995 and 2000.