But English, being a de facto universal language, has good creativity to invent new words, either from native speakers or from foreign influences. For example, the word "D'oh" didn't exist until Homer Simpson (Dan Castellaneta) popularized it. And I think the word "meme" didn't exist either 40 or 50 years ago.
I think a good way to know that is to read newspapers from 100 years ago or older, and see how people from US were called.
But English, being a de facto universal language, has good creativity to invent new words, either from native speakers or from foreign influences. For example, the word "D'oh" didn't exist until Homer Simpson (Dan Castellaneta) popularized it. And I think the word "meme" didn't exist either 40 or 50 years ago.
I think a good way to know that is to read newspapers from 100 years ago or older, and see how people from US were called.