Before revision: The presidential system is the dominant form of government in the mainland Americas, with 18 of its 22 sovereign states being presidential republics, the exceptions being Canada, Belize , Guyana and Suriname.
After revision: The presidential system is the dominant form of government in the mainland Americas, with 17, Peru of its 22 sovereign states being presidential republics, the exceptions being Canada, Belize , Guyana and Suriname.