became the Republic of Sierra Leone on 19 April 1971. Stevens left the office of prime minister two days later and became President of Sierra Leone. The office of the prime minister was later abolished on 15 June 1978. Solomon Islands The Solomon Islands became independent on 7 July 1978 with Peter Kenilorea as the first prime minister. Reference South Africa Daniel François Malan was the incumbent prime minister of the Union of South Africa when Elizabeth became queen. Reference Following a referendum, South Africa abolished the monarchy on 31 May 1961, becoming the Republic of South Africa. Verwoerd remained in office as the republic's first prime minister until 6 September 1966. The office of the prime minister was later abolished on 14 September 1984. Tanganyika Tanganyika became independent on 9 December 1961, with Julius Nyerere as its first prime minister. Nyerere had previously been the prime minister of self-governing Tanganyika. Reference Tanganyika abolished the monarchy on 9 December 1962. The post of prime minister was abolished. Trinidad and Tobago Trinidad and Tobago became independent on 31 August 1962, with Eric Williams as its first prime minister. Williams had previously been Chief Minister and Premier of Trinidad and Tobago. Reference Trinidad and Tobago abolished the monarchy on 1 August 1976. Williams remained in office as the republic's first prime minister until 29 March 1981. Tuvalu Tuvalu became independent on 1 October 1978 with Toaripi Lauti as the first prime minister. Lauti had previously been Chief Minister of Tuvalu. Reference Uganda Uganda became independent on 9 October 1962 with Milton Obote as the first prime minister. Obote had previously been the prime minister of self-governing Uganda. Reference Uganda abolished the monarchy on 9 October 1963. Obote remained in office as the republic's first prime minister until 15 April 1966. United Kingdom Winston Churchill was the incumbent prime minister when Elizabeth became queen. Reference Anomalous cases Grenada (1979–1984) Maurice Bishop held de facto government control for most of the People's Revolutionary Government period (from 13 March 1979 until 14 October 1983). On 14 October 1983 Bishop was deposed by Bernard Coard and Bishop was killed on 19 October. Coard held power only briefly before military government was declared. After the invasion Grenada's pre-revolutionary system of government, and the office of Prime Minister, was restored on 4 December 1984. The website of the Grenadian government lists Bishop as a former prime minister, but