Prime Minister of Rhodesia held the post until the end of Federation on 31 December 1963. When Northern Rhodesia gained independence as Zambia on 24 October 1964, Southern Rhodesia began to refer to itself simply as "Rhodesia". Prime Minister Ian Smith's government issued a Unilateral Declaration of Independence from Britain in 1965, and he remained Prime Minister when the country was declared a republic in 1970. Under the Internal Settlement in 1979, after a long period of conflict, the country became known as Zimbabwe-Rhodesia, with Abel Muzorewa as its first black Prime Minister. None of these acts were recognised internationally, and under the Lancaster
Northern Rhodesia of Northern Rhodesia. Welensky led a move in the Legislative Council to restrict the British South Africa Company's mineral rights which garnered African support; the Company agreed in 1949 to assign 20% of its revenues to the Government, and to transfer all its remaining rights in 1986. As early as 1915, the British South Africa Company proposed amalgamating Southern Rhodesia and Northern Rhodesia, but this was rejected by the Southern Rhodesian legislature in 1917, as it might have prevented Southern Rhodesia obtaining self-government. This option was again rejected in 1921, for the same reason. After the Southern Rhodesian electorate voted