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 Ila and plateau Tonga peoples, but the United National Independence Party was dominant elsewhere. Roy Welensky, a Northern Rhodesian settler who was the Federal Prime Minister from November 1956 had convinced Alan Lennox-Boyd, Colonial Secretary from 1954 to 1959, to support Federation and to agree that the pace of African advancement would be gradual. This remained the view of the British cabinet under Harold Macmillan until after the declaration of the States of emergency, when it decided to set up a Royal Commission on the future of the Federation of Rhodesia and Nyasaland to be held in 1960. This became