In the politics of the United States, a government trifecta is a political situation in which the same political party controls the presidency and both chambers of Congress. The term is primarily used in the United States, where it originated, but can be used for control of the executive branch and both chambers of the legislative branch in any country that has a bicameral legislature and an executive that is not fused. It is borrowed from horse race betting.
Most countries and all democracies have some degree of separation of powers into separate branches of government, typically consisting of an executive, a legislative, and a judicial branch, but the term government trifecta is primarily applied to countries in which the executive is not elected by the legislature and where the legislature is not sovereign; in parliamentary systems, the executive or part of it is elected by the legislature and must have the support of the majority of Parliament.