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The government of South Africa is a parliamentary democracy. In this system of government, the citizens vote for legislators who then elect a new chief executive.
In a parliamentary democracy like the one in South Africa, the citizens participate in elections to choose the members of the National Assembly, which is the lower house of the South African Parliament. Then, this National Assembly elects the President of South Africa.
Similar to what happens in the United States, the federal government of South Africa has three branches. The Legislative branch is the Parliament. The Executive branch is the President. And a judicial branch the Constitutional Court.