Northern Rhodesia had been detained without trial, following claims that they had planned the indiscriminate killing of Europeans and Asians, and of African opponents, the so-called "murder plot". Shortly afterwards, on 12 March 1959, the governor of Northern Rhodesia also declared a State of emergency there, arrested 45 Zambia African National Congress including Kaunda and banned the party. Kaunda later received a 19-month prison sentence for conspiracy, although no credible evidence of conspiracy was produced. The declaration of States of emergency in both Northern Rhodesia and Nyasaland marked the end of attempts by their nationalist parties to work within the colonial system,
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