Racism is definitely more of an issue in this country than in many parts of Europe. When I visited England, everyone shared a similar culture, dress, speech patterns, etc. I saw people mixing even better than they do here in the northern US.
My guess is that slavery was stopped later in the US and the Jim Crow laws held us back. Then there is a subculture of some degree of anger, resentment and black pride in some black communities that is understandable but certainly not productive.