Philadelphia would make a peachy new Capital.
I’d go with something closer to the center of the country.
Maybe the Kansas/Colorado/Nebraska corner, or the tip of the Oklahoma panhandle?
Location chosen to be marginally more defensible, and more to the point, to be in “flyover” country, in the hopes that people who hate ordinary Americans stay the heck out of government!
(Wouldn’t Atlanta be “peachy”, with Philly being more “cheese steaky”?)...