There’s actually a Wikipedia article on USA demonyms: https://en.wikipedia.org/wiki/Demonyms_for_the_United_States
Spanish actually uses “estadounidense” (~“United Statesian”), because they do use “American” to refer to inhabitants of the continent. In English, “US-American” is probably the best option, though “United Stater” doesn’t sound terrible, either.
Sure feels like an imperial thing.
There’s actually a Wikipedia article on USA demonyms: https://en.wikipedia.org/wiki/Demonyms_for_the_United_States
Spanish actually uses “estadounidense” (~“United Statesian”), because they do use “American” to refer to inhabitants of the continent. In English, “US-American” is probably the best option, though “United Stater” doesn’t sound terrible, either.