OMG, how could I have forgotten that the country taking up less than a quarter of two continents, both called America, called dibs on "American"? Sorry Beta #1. I shall discard the fact that there are 34 other countries which use the demonym "American".

you can just say ~~Americans~~ people, everyone will know ~~who~~ you're talking about USA.

Fixed this for you. Kind of a pet peeve of mine when people use 'defaults', like everyone on the internet are in America, or if you're talking to someone from a capital of a different country they will assume you're also in the capital, everyone lives in America timezone, everyone using English uses en_US locale, and if by some bizarre chance you're in another country you can only switch language and country together, etc

Ask someone from South America

Because USians didn't stick, but their pompousness continued on. E: in the form of saying usamericans