English Translation
We are not Americans.
This phrase is problematic: if the meaning is not we’re not from the US, then it should be No somos estadounidenses. Almost no ones refer to people born on the Americas as Americans.
At least in Spain, I think the word is changing meaning from “from America” to “from the USA”, probably under the influence of english. I would say that currently, if it is not clear from the context, it can lead to some ambiguity on whether you refer to one or the other meaning.
Just as an added note, the rae does list both as correct