Washington D.C., formally known as District of Columbia, is the capital city of United States. It was established by Constitution as federal district separate from states for national government purposes.
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Federalism: A system where power is divided between national and state governments.
Capitol Building: The home of the United States Congress and seat of legislative branch of U.S. federal government.
Three-Fifths Compromise: An agreement reached during Constitutional Convention stipulating that each slave would be counted as three-fifths person for purpose of taxation and representation.