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The Republic of South Africa is a parliamentary representative democratic republic. The President of South Africa serves both as head of state and as head of government. The President is elected by the National Assembly and must retain the confidence of the Assembly in order to remain in office. South Africans also elect provincial legislatures which govern each of the country's nine provinces. Since the end of apartheid in 1994 the African National Congress has dominated South Africa's politics
Nigeria is a federal republic modeled after the United States, with executive power exercised by the president. The government of Nigeria is also influenced by the Westminster System model in the composition and management of the upper and lower houses of a bicameral legislature.The president, however, is the head of state, the head of government, and the head of a multi-party system.Nigerian politics takes place within a framework of a federal, presidential, representative democratic republic, in which executive power is exercised by the government.egislative power is held by the government and the two chambers of the legislature: the House of Representatives and the Senate. Together, the two chambers make up the law-making body in Nigeria, called the National Assembly, which serves as a check on the executive arm of government.