[nozzlegear]

I'm citing a rule, not making one. American is in the dictionary, used by the UN, recognized by everyone and their dog as the proper demonym for citizens of the United States. Who are you to question that authority and replace the proper demonym with a neologism?

[stkdump]

I didn't. Languages aren't defined by dictionaries. If they were they would not have come into existence in the first place and they wouldn't evolve the way they do.