Good call - I also prefer USA made in anything I can get.
Someone will chime in about the Springfields origin. Its confusing but if I remember correctly the frames are made in Brazil and the lower priced guns are finished there. Once you step up to the Operator line they are assembled in the USA. Correct me if I am wrong about that.
But, Colt and STI (non-spartan, not because they aren't good guns just cause they arent 100% USA made) are my picks for USA made 1911s. I have 2 of each and wouldn't part with them. I also have 2 Springfields and like them equally.
Kimber is another USA made 1911. You will get mixed opinions on those, well all 1911's actually, but Kimber takes the most heat. I have shot a few and liked them myself but no long term use.
If I'm not mistaken, Para is moving or has moved production from Canada to the USA but I've only put a few mags worth of ammo downrange on a Para. It was that new GI model. Pretty nice gun.
I'm sure there are other guns, maybe DW or Fusion that I dont know much about. Then of course you get into the Wilson, Ed Brown, Les Baers, Nighthawks, and even pricier full custom guns.
Hope thats a start.