@jafant That Ayre uses Cardas wire so extensively is a clue that they source their copper from domestic sources, certainly not China. Charles Hansen was a huge fan of Cardas. And he posted at audioasylum regarding his experiences visiting speaker and electronic manufacturers in China. I think that informed his resolve to source as much as possible from domestic suppliers.
To my ears, the Cardas hookup wire was a really nice improvement over the OEM wire in my 2.4 upgrade.