You know what's funny here. I can tell that from your niece's reply that she is very condescending and patronizing. In her mind SHE is the enlightened one and you all are the narrow-minded jingoists. Up until now, she could get away with her fantasies in privacy. But NOW she is BUSTED. The most influential forum on the Web is hip to her antics and now SHE will have to justify her beliefs, which as we see, is based on FALSE information. Plus she might have to explain to a lot of outraged parents whether or not she has been teaching her students that it is WRONG for Americans to call themselves Americans.
From now on, your niece won't be protected by her close-minded Leftist security blanket consisting of the standard leftist drivel. She will have to defend her silliness with FACTS.