Hacker News Reader

One more data point. In my experience in Spain people definitely use estadounidense outside of legal documents. You could hear, or read, "la artista estadounidense", for instance.

"Americano" is used too, as well as "afroamericano" (not "afroestadounidense").

I'm a native Spanish speaker and most, if not all, people I know use "Estadounidenses" or "yankees" (colloquially). I do see "Americanos" used in translated media though.

Fun fact: an "Americano" also means an espresso with water added

Which is borrowed from Italian, not Spanish.

Ditto for Italian: "Americani" is much more common than "Statunitensi".