It specifically constitutes the three branches in D.C.

United States of America (USA) [ju:’naitid ‘steits av e’merike] noun independent country, a federation of states (originally thirteen, now fifty in North America; the United States Code = book containing all the permanent laws of the USA, arranged in sections according to subject and revised from time to time COMMENT: the federal government (based in Washington D.C.) is formed of a legislature (the Congress) with two chambers (the Senate and House of Representatives), an executive (the President) and a judiciary (the Supreme Court). Each of the fifty states making up the USA has its own legislature and executive (the Governor) as well as its own legal system and constitution.