Praxis is based in Santa Cruz, but the parts are manufactured in Taiwan. I can't think of any other options. (IRD is also Taiwan I think
https://www.interlocracing.com/shop?search=crank .)
Rene Herse says "assembled in Seattle" which I think means the parts aren't from the US, but I am not completely sure.
https://www.renehersecycles.com/prod...onents/cranks/
Further reading on American manufacturing:
https://www.theonion.com/economists-...ybe-1819572665