The federal government of the United States (U.S. federal government or U.S. government) is the common government of the United States, a federal republic located primarily in North America, comprising 50 states, five major self-governing territories, several island possessions, and the federal district (national capital) of Washington, D.C., where the majority of the federal government is based. The U.S. federal government is composed of three distinct branches: legislative, executive, and judicial, whose powers are vested by the U.S.
https://en.wikipedia.org/wiki/Federal_government_of_the_United_States