Amerigo Vespucci was a genocide collaborator, in case anyone's wondering why it would be awful to call the indigenous people of the continents of the western hemisphere "Americans"

it's referring to a people using the language of their oppressor. each indigenous group has their own signifier like "First Nation People," "Indigenous American," "Native American," or "American Indian." you're going to have to make a choice about how to refer to people, but as @Jax@sh.itjust.works said, about the only wrong answer is "American"