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 Godfrey Huggins, the Prime Minister of Southern Rhodesia because of opposition from Africans and from within his own party. He did not entirely rule out federation, which had been proposed by a conference held at Victoria Falls in 1949 between the Southern Rhodesian government, and the elected, or "unofficial" members of the Northern Rhodesia Legislative Council led by Roy Welensky, without any Africans present. It was left to his successor in post in 1950 to 1951, James Griffiths, to begin exploratory talks with Huggins and Welensky representing the white minorities of both Rhodesias, subject to the opinion of the majority