The District of Columbia is not a state and isn't allowed to act like one. DC has no vote on matters before Congress. Although the Home Rule Act of 1973 allows a local government to handle District affairs, it is still overseen by those elected to represent other states. DC voters do have a say in who gets to be President, but that took until 1961 with a Constitutional amendment.
Virginia didn't ratify the amendment, although in 1846 Congress returned to Virginia a large piece of the district. Lincoln called it unwise and others thought the gift unconstitutional and unsuccessfully tried to take it back. The District diamond still has the blues.
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