A surprising amount is made in the states and provinces around the Great Lakes. Most of the parts come from Magna, a Canadian firm with factories around the world.
Mostly in the U.S. It’s been that way in the auto industry forever. What grinds people is that the smaller, mom & pop-type suppliers to the auto industry are mostly out of business. So when you drive up and down Woodward Ave. in Detroit, you see all the vacant buildings, and you don’t see the parts and sub-assemblies coming from Indiana, Ohio, and (yes) Canada.
“American made cars” = American assembled cars. Where are the steel factories and fab shops located where all the parts and sub-assembles are “made”?
May want to check your facts on that “assembled” part. Check out Bodine Aluminum for one. Never heard of them? They make the engine blocks and transmission housings for Toyota (they are owned by Toyota) There are more American companies making parts for these “assembled in America” cars than you could imagine