Pierre Charles L'Enfant designed the layout of the US capital. Due to disagreements with the city commissioners, he was fired, and it was only a century after, when his plans were realized by the McMillan Commission.
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The first US capital was Philadelphia. This would be the oldest capital of the US.
No why would they it was from afgaistan
Never, really, in that it was never officially stated to be the capital of the US. If you're willing to be generous in your definition of "capital", then it would be possible to fudge a little and say that it was the capital of the US while Congress met there from November 1783 to August 1784.
The Capital of the US- Washington DC, is SOUTH of Maryland. If Maryland became part of the Confederacy, the US Capital would be surrounded by the Confederate States. And THAT would be rather awkward.
Strictly D.C. But the loss of Maryland would have put Washington in grave danger.