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 crashed in 1931. An international agreement restricted output. This caused a catastrophe in Northern Rhodesia where many employees were sacked, and put an end to hopes which many Europeans had held of turning Northern Rhodesia into another white dominion like Southern Rhodesia. Many settlers took this opportunity to move back to Southern Rhodesia, while Africans returned to their farms. Despite the economic crash large firms were still able to maintain a profit. The fact that unemployed workers had left meant there were no increases in taxation, and labour costs remained low. At a 1932 conference of copper producers in New