As I stated elsewhere, America's median income, adjusted for cost of living, is one of the world's highest. Americans benefit from cheap goods from other countries.
It might be socially acceptable to put the domestic economy first, but that doesn't mean it is right. Ultimately, it's basically the same as the "looking out for #1" philosophy that rich people allegedly have, which is being condemned in this thread -- but at the rich country level rather than the rich individual level.
Try this calculator: https://howrichami.givingwhatwecan.org/how-rich-am-i