12/12/1800 Washington D.C. becomes capital of the US
Ask History: First U.S. Capital | History
Why is Washington D.C. the U.S. capital?
Building a Nation's Capital: Washington D.C. | The B1M
The city of Washington was created to replace Philadelphia as the nation’s capital because of its geographical position in the center of the existing new republic. The states of Maryland and Virginia ceded land around the Potomac River to form the District of Columbia.