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 Northern Rhodesian settlers were only prepared to join Southern Rhodesia if there were no other way to achieve minority rule. When Northern Rhodesia's mining industry suffered a major downturn in the 1930s, its representatives pushed for amalgamation in January 1936 at Victoria Falls, but the Southern Rhodesian Labour Party who blocked it, because the British government objected to Southern Rhodesian policies of job reservation and segregation being applied in the north. Shortly after the Copperbelt strike of 1935 there was an election to the legislative council, in which all candidates supported investigating the amalgamation of Northern and Southern Rhodesia. After