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Wikipedia: Washington, D.C. , formally the District of Columbia and commonly referred to as Washington, the District, or simply D.C. , is the capital of the United States, founded on July 16, 1790. The City of Washington was originally a separate municipality within the Territory of Columbia until an act of Congress in 1871 effectively merged the City and the Territory into a single entity called the District of Columbia. It is for this reason that the city, while legally named the District of Columbia, is known as Washington, D.C.
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