The EU will take action too. Germany isn't going to allow its automobile industry to be hollowed out. [1]
The American car market 17% of the market with ~4% of global population seems very easily sustainable. A country like Japan who operates and is expanding in the United States [2] runs strongly counter to your point of view here.
[1] https://www.cnbc.com/2026/09/30/china-warns-europe-increases... (just a recent article, you get the picture - Europe will protect its markets too)
[2] Just an example: https://www.dispatch.com/story/business/manufacturing/2026/0...