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 no further white minority governments would be permitted, dismissing settler aspirations of self-government in Kenya and Northern Rhodesia. This turned Northern Rhodesian Europeans against association with East Africa towards union with Southern Rhodesia. In 1933, a substantial minority in the Northern Rhodesian legislature favoured amalgamation with Southern Rhodesia, despite vigorous African opposition. However, the majority of settlers were still cautious about being marginalised by the much greater numbers of Europeans in Southern Rhodesia. From 1943, six Provincial Councils were set up to form a second tier of African representative institutions above the Native Authorities. These were purely advisory bodies, whose