The Constitution of Tanzania, formally Constitution of the United Republic of Tanzania and also known as Permanent Constitution or Fourth Constitution of Tanzania, was ratified in 1977. Before the current establishment, Tanzania has had three constitutions: the Independence Constitution (19 hi61), the Republican Constitution (1962), and the Interim Constitution of the United Republic of Tanganyika and Zanzibar (1964). History Independence Constitution (1961-1962) After independence from the United Kingdom, Tanganyika adopted a first constitution based on the Westminster Model (with the exclusion of the Bill of Rights). This defined a Governor General who represented the Queen of Tanganyika, Elizabeth II, to be the formal head of state. The executive was led by the First Minister or the Prime Minister, chosen from the majority party. The constitution also established the independence of the judiciary. Republican Constitution (1962-1964) In 1962, the Tanzanian Parliament (made solely of nominees from the Tanganyika African National Union party) formed itself into a constituent assembly and drastically revised the 1961 constitution, most notably with the establishment of a strongly presidential system. The new President of Tanzania was granted the prerogatives of both former roles, Governor General and First Minister, serving as the head of state as well as commander in chief of the armed forces. He was granted the right to designate the vice president and Ministers, and the right to dismiss the Parliament under certain circumstances. The President also inherited security-related, repressive powers that were formerly of the Governor General, with the addition of new ones; the Preventive Detention Act, for example, gave the President the right to detain any person without trial. Interim Constitution (1964-1977) In 1964, Tanganyika and Zanzibar merged into the United Republic of Tanganyika and Zanzibar, renamed into "United Republic of Tanzania" that same year. The constitution of the newborn nation was based on Tanganyika's 1962 Republican Constitution, modified according to the agreements between TANU and Zanzibar's majority party, the Afro-Shirazi Party (ASP). These agreements had been ratified under the name "Articles of Union", and became part of the new constitution as "Acts of Union". The most notable feature of the Acts of Union was the establishment of the double government structure that is also part of Tanzania's current constitution. This structure included one government for the Union and one largely autonomous independent government for Zanzibar. Zanzibar's government included its own Parliament and President. The President of Zanzibar also served as vice president