Evie
Pronounced like Eevee
I just love how people argue that "American" is confusing. In the English language there is no confusing what "American" refers to. Anyone who thinks otherwise, so far as I can tell, just has some ridiculous spite towards the US. North American, South American, Latin American, etc all work when referring to the more general groupings. If you really need a term to group them all at once (and never in 20 years have I seen this) you can easily say North and South Americans. Bam, done. I'm sure it's used just as often as I refer to all the Eurasians.
I don't think anyone said it was confusing (in English, anyway - not quite the same story in Quebec French and Latin American spanish)
Most of those people (who grew up with the linguistic equivalent of "american" in their language having two meanings) find it highly annoying.
Calling it "ridiculous spite" really doesn't help your case. But then, it seems most Americans feel it would be personally painful to try to understand point of views other than their own.
As I said, people will call you USians or Unitedstatesians. You will call yourself Americans. There is nothing either group can do about what name the other use.