Americans
Okay, there are two continents called that, though. The country being talked about doesnt even cover half of one.
US Americans
Fuck thats a lot to type for some arrogant entitled shit heels that think they just deserve everyone else's labor. Nope.
USians
Sounds silly, like the idiots from the absurd place it's referring to. Plus it feels condescending, which IMO they tend to deserve–they're not exactly a well educated people.