common roll. The Asiatic Land Tenure and Indian Representation Act, 1946 allowed Indians in the Transvaal Province and Natal Province to elect three members of the House of Assembly and two senators, but this representation was removed by the Asiatic Laws Amendment Act, 1948. The Separate Representation of Voters Act, 1951 removed coloured voters in the Cape from the common voters' roll and placed them on a separate roll, allowing them to elect only four members to the House of Assembly. It was not, initially, passed with a two-thirds majority, and the Appellate Division of the Supreme Court invalidated it on this basis, precipitating the "coloured vote constitutional crisis". The government subsequently altered the method of election of the Senate and passed the South Africa Act Amendment Act, 1956 with a two-thirds majority, validating the Separate Representation of Voters Act. The Promotion of Bantu Self-government Act, 1959 abolished the remaining parliamentary representation for black people under the Representation of Natives Act. The Separate Representation of Voters Amendment Act, 1968, abolished the remaining parliamentary representation for coloured people, and the Coloured Persons Representative Council Amendment Act, 1968 replaced it with an elected "Representative Council" with limited powers. The Prohibition of Political Interference Act, 1968 prohibited multi-racial political parties. The Republic of South Africa Constitution Act, 1983 established a tricameral Parliament with separate houses representing whites, coloureds and Indians. Blacks remained unrepresented. The Constitution of the Republic of South Africa, 1993 established universal non-racial adult suffrage. Separate development and bantustans The Native Administration Act, 1927 gave the executive government wide-ranging authority to govern the "native reserves", and the people living in them, by proclamation. The Bantu Authorities Act, 1951 established a hierarchy of tribal, regional and territorial authorities, led by chiefs and appointed councillors, to govern the reserves. The Promotion of Bantu Self-government Act, 1959 provided for the development of the territorial authorities into self-governing bantustans. The Bantu Investment Corporation Act, 1959 established a corporation to develop the economies of the bantustans. The Transkei Constitution Act, 1963 made the Transkei an autonomous self-governing territory, with a partially elected assembly. The Bantu Homelands Development Corporations Act, 1965 established separate economic development corporations for the various homelands. The Bantu Homelands Citizenship Act, 1970 made black people citizens of one of the bantustans, with the intention that when the bantustans became independent they would cease to be South African citizens. The Bantu Homelands Constitution Act,