The ONLY off-the-shelf 1911's made entirely in the U.S.A. are the Les Baer's and Coonan's, as far as I know. Les Baer has their own factory and they CNC machine all their own slides and frames. Coonan does the same, and makes all his other parts (or many of them) as well. This may be true of Nighthawk Custom as well. EGW and Cylinder & Slide parts are all U.S. made.
There are other very high end custom 1911 shops that do their own frame and slide CNC work, and shop their small parts out from EGW and The Cop Shop. $5K and up. All well worth the price.
If you want to be 100% dead certain that nobody not born-and-raised 3+ generations 'Murcan has ever had a hand on your gun, you will have to get an FA. Coincidentally the finest handgun you can buy for any price. $2500 base price, and the sky's the limit.
But, honestly, I'm sorry you feel the way you do about the SA frame and slide being forged in Brazil. God knows those poor kids need to be able to find some gainful employment, and need to be able to steal enough guns to keep their veins fed.