Just Curious.

Colt, Smith & Wesson, Hi-Point, Taurus, Charter Arms, Heritage, American Derringer are just some. Others are made overseas and assembled here.

Most Taurus and Springfield Armory are built in Brazil.

Ruger is the only major company that builds 100% of its firearms in the USA.
There are some smaller companies that only build a few guns, that are also wholly US companies. S&W imports their SW99 platform from Walther, and their hunting rifles are made by FN in Japan.
I'm sure Colt only builds a few guns for the public, they are mainly a government contractor now.

I believe Kel Tec's are also USA made.

FN = M16 rifle deployed by our troops
Ruger, S&W, Kahr, Keltec, Colt, Rock River, Kimber, Some Springfiled 1911’s, Bushmaster, Mossberg.
I know I added some long guns. I got carried away.