"Black" people are no more black than "White" people are white. What - you think you're white? Put your hand up against this screen and see. You answer a question on ethnicity with "Caucasian"? You or your ancestors were from the Caucasus region of southern Russia, eh? No, you're a mix of English, Irish, German, French and who-knows-what like me? Personally, I answer "some other" or "human" on those stupid questionnaires. "Race" has no biological meaning, and I doubt if there is such a thing as a guaranteed pure anything.

I see nothing at all inappropriate with using "African-American" as an expression of ethnicity...in fact, it is probably the only one of the current racial denominators that has any validity at all.