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 for self-determination in 1922, this objection ceased, and in 1927 the Conservative Colonial Secretary, Leo Amery gave Southern Rhodesia settlers the impression that he supported their claim to acquire the more productive parts of Northern Rhodesia. At the end of the First World War, the European population of Northern Rhodesia was tiny, about 3,000 compared with ten times as many in Southern Rhodesia, but it increased rapidly after the discovery of the Copperbelt in the 1920s. Northern Rhodesian settlers wanted self-government for the European minority electorate, separate from Southern Rhodesia. However, once the British government appeared to reject the idea