"God is the name by which I designate all things which cross my path violently and recklessly, all things which alter my plans and intentions, and change the course of my life, for better or for worse."
-C G Jung
There are differences in races but it is culture not color. Hopefully or at least ideally when people immigrate to America they will slowly assume the American culture even if it takes a generation or two. The one exception to this rule may be the Muslims who's very religion rejects our culture so assimilation with them may be difficult or impossible.
What I am saying is that IF you avoid going to a black neighborhood because it is black and you therefore think that it is more likely that you would be victimized by crime, that is discrimination based on race. It is not illegal. Is not such discrimination SOMETIMES justified?