Well to be fair I think the AA looks like it draws from many early American sources - all the monuments in Philadelphia and Washington.
Most importantly, it draws from monuments that are late 1700's / early 1800s. Not modern American. However, this being EPCOT, at one point, the AA was designed to look very much like this, a big round pavilion at the lake end of FW, with the ride at the second floor, open at the ground floor, when walking underneath it you would get a reveal of World Showcase, much like the reveal when walking underneath the Train Station at the MK:
...but the AA didn't end up being build like this. They opted for the colonial instead of modern style. For better or for worse. Maybe for worse is that it does all resemble Liberty Square a great deal. Too bad. The choice has been made. So stick with it. Modern uniforms in the colonial AA are as mistaken as colonial costumes would be in that modern pavilion.