I'm in the same boat. The only US-made I found were by Gustin, but they were expensive and the elastic was meh. Everlane has yet to offer socks (non-US but very accountable). Allbirds has cheap(er) eco-groovy socks, but I don't know where they're made. Lemme know if you ever crack that nut, I'm glad I'm not the only person obsessed with trying to ethically source every item of clothing.