Example image of eyePlorer eyePlorer map for 'Federal government of the United States': Government State governments of the United States U.S. state United States United States Constitution Executive (government) Judiciary Legislature Separation of powers under the United States Constitution Policies of the United States Popular sovereignty Tenth Amendment to the United States Constitution Federal district Seat of government United States Congress Washington, D.C. Bicameralism United States House of Representatives United States Senate Congressional district Resident Commissioner American Samoa Guam Puerto Rico Resident Commissioner of Puerto Rico Virgin Islands Population United States congressional apportionment Supermajority Necessary and Proper Clause Plurality voting system Two-round system Washington United States congressional committee 108th United States Congress Library of Congress Civil liberties Impeachment in the United States President of the United States Twenty-fifth Amendment to the United States Constitution Vice President of the United States Electoral College (United States) President Running mate Term limits in the United States Vice president Diplomat Head of government Head of state Barack Obama