Political Correctness

I do not ever remember anyone calling me a European American or a Caucasian American, so why are black people always referred to as African Americans? What if they are from Haiti? After how many generations of being born in America, can we all just be called Americans without some other country of origin being placed first? I understand that some people came to this country because they wanted to and some were brought here against there will. I just think that at some point we are all just Americans.