In Italy we use the word "americani" (Americans) but we can also use the word "statunitensi" (that would be Unitedstaters). It's not as common but everybody understands it. IMHO the latter term is more appropriate but I agree that when speaking English one should use whatever the English speakers use (the same for any other language.) If you guys will change the way to refer to the citizens of the USA, I'll do it too.