In spite of the fact that they shared physical characteristics, European individuals were once considered to be of a different race if they spoke a different language. What we know today as Europe is itself the product of many wars and involuntary interbreeding between victors and the vanquished. Without the distinction of color, racism today would be simply called survival of the fittest. Others see race in terms of purity and impurity, and use statistics as a thin veil for their hatred. Protestants and Catholics have been doing that in Northern Ireland, as have the Serbs and Bosnians, and now Kosovars in Yugoslavia, and the Czarists and Bolsheviks in Russia.
Hatred knows no race.
It only knows itself. Strip away the veneer of race, and we'll see hatred for what it is. White supremacists and black separatists are peas from the same pod, trying to protect something that can't be protected, our ability to choose who we will love and marry, and our will to do so. A reasonable case could be made that men and women are indeed of different races. But then, there would be no plausible way to justify one group's annihilation by the other.