I'm willing to pay more for higher quality products.... Sometimes those products are produced/manufactured here in the U.S. Often, though, a product that says "Made in the USA" is only finished in the U.S. from parts manufactured in other countries. And, often, products that you would consider to be foreign-made are largely produced here in the U.S.
For example, most of the steel imported to China comes from the U.S. If everyone in the U.S. stopped buying any products manufactured in China, we would see a negative impact on our steel industry here.
DH and I have recently gotten more strict about buying foods grown and produced here in the U.S. (or sometimes Canada). We've been reading quite a lot about the different standards for insectisides and environmental cleanliness in other countries and have more confidence that U.S.-grown/caught/produced foods have tighter controls.
DH and I have had this discussion today regarding the possibility of the gov't propping up the U.S. auto industry. Yes, there are some U.S. jobs that would be lost if the U.S. auto companies fold, but by and large, manufacturing of U.S. cars is done in foreign countries (Mexico and Canada are two big ones). While cars that you would think of as Japanese-made are often manufactured here in the U.S.
IMO, it's pretty darn difficult to define "U.S. made". I and the country are better off if I use my money to buy the best quality products that I can reasonably afford and use any savings to buy even more products.