Many audio things labeled as Made In USA contain parts that come from outside the US. I have products that are Made In USA that contain batteries made in China. I have products that are Made In USA that contain crystals from all over the world, Brazil, India, wherever. They’re still made in the US. Designed and assembled. There is no standard for what should be labeled
Made In USA. Some things are Designed in USA, assembled in China. Is Apple an American product or Chinese? Some technology Made In USA is stolen and produced outside USA.
Weren’t the ubiquitous Continuous Cast Copper conductors a Japanese invention?
A couple years ago there was someone who compiled a compendium of audiophile products that were Made In the USA, including those that contained parts made outside USA. To whit,
http://americanmadeaudio.com/the-list/