The federal government of the United States (U.S. federal government or U.S. government) is the national government of the United States, a federal republic located primarily in North America, composed of 50 states, five major self-governing territories, several island possessions, and the federal district (national capital) of Washington, D.C., where most 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