OK, I'll give you a small benefit of the doubt that "negro" was the common and accepted term, but that was a long time ago. Even still, it literally just means black, so your point is really stupid. You're saying Americans refuse to call them black and only call them black. It's stupid as fuck.

Also, for the "negroid race" thing, race is made up. Black is almost certainly more accurate than that shit.

Finally, one last thing, calling people black is far from an American thing. It's the norm around the world (using the native language's word for black usually).