American cars are generally less expensive than foreign cars, not more. German cars are generally much more expensive than comparable American cars, and Japanese cars are usually a bit more expensive too. Both these nations have tried reducing costs by moving some of their production to places like Thailand, Mexico, and the USA (!). Labor rates in Germany and Japan are probably the highest in the world.
Making foreign cars more expensive will only make American cars a bit more expensive, due to higher demand, but in general will just raise prices for everyone.
People don't buy foreign cars these days because of cost. They buy them because of perceived higher quality, styling/performance preferences, brand cachet, etc. If they start selling Chinese-made cars here, maybe that'll change, but for now, saving money is not the reason you buy a foreign car. If you want a cheap-ass car, you buy something like a Chevy Spark or Ford Fiesta. (Worse, those cars might be made in Mexico anyway. I'm guessing the cheapest American-made car is probably a Honda Fit or some Toyota maybe.)
Making foreign cars more expensive will only make American cars a bit more expensive, due to higher demand, but in general will just raise prices for everyone.
People don't buy foreign cars these days because of cost. They buy them because of perceived higher quality, styling/performance preferences, brand cachet, etc. If they start selling Chinese-made cars here, maybe that'll change, but for now, saving money is not the reason you buy a foreign car. If you want a cheap-ass car, you buy something like a Chevy Spark or Ford Fiesta. (Worse, those cars might be made in Mexico anyway. I'm guessing the cheapest American-made car is probably a Honda Fit or some Toyota maybe.)