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United States

United States of America

Common lawFederal presidential constitutional republicReviewed· 2026-06-18
Capital
Washington, D.C.
Population
335,000,000
Languages
English, Spanish
Currency
USD

United States · Constitution

Constitution of the United States

The oldest codified national constitution still in force. Seven articles establish the three branches and the federal balance; twenty-seven amendments follow, the first ten of which form the Bill of Rights. Amendment requires two-thirds of both chambers of Congress and ratification by three-quarters of the states.

The constitutional text

The oldest codified national constitution still in force. Seven articles establish the three branches and the federal balance; twenty-seven amendments follow, the first ten of which form the Bill of Rights. Amendment requires two-thirds of both chambers of Congress and ratification by three-quarters of the states.

Separation of powers

Strict separation between Congress, the President and the federal judiciary, checked by veto, impeachment, advice-and-consent over appointments, and judicial review established in Marbury v. Madison (1803).

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