Of course there's ignorant individuals left and right, but America certainly isn't the dumbest of all. What's more, most of America's population immigrated from other places, so going by your logic, that would be saying that every other country is as stupid, if not more stupid than America
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Also, I don't know about you, but I certainly was never taught that I was better than everyone else around me, let alone
every other country out there. That wouldn't be right, as it would imply that the country my family is oringinally from, Poland, is inferior to America, as well as any other country a certain person, or their family originated from.