Show me an entirely Japanese bike or an entirely French or Italian bike? Japan is more reasonable since they have Panaracer (tires are usually the toughest point) and I think the top end Shimano cables and housing are made in Japan but they make even some of their highest end stuff in multiple countries and of course for just about everything materials are usually quite global.

US made is mostly possible if you source tires elsewhere and run a single speed or an old boutique Paul or White Industries or similar derailleur and then chain and cassette would likely come from overseas however a single speed would allow a White Industries freewheel but your chain would come from elsewhere and any cables and housing would likely come overseas as well or if PowerCordz is still around those are an option but I would rather have good ole' Jagwire Pro or Elite Link rather than something in plastic.

If you knew the world you would know we are a global economy and that isn't always a bad thing and something made outside of the U.S. is not bad and bringing production to the U.S. isn't bad either but isn't always good. Certainly there are issues surrounding everything.