There are no "other races' of humans. There is only one living race of humans. There is no genetic reason that any member of any ethnic population can not reproduce with a member of another ethnic group. This fact is the defining item that makes a creature a member of one race.
It also means that all those racists ( nazis, clan members, extremist Jews, extremist muslims, extremist Hindus, extremist anybody, BNP, other idiot nationalists of your choice, white separatists, Black separatists, etal, who base their philosophy on the idea that those dirty foreign folks over there are not the same race as us) are full of crap.
There are many vaguely defined ethnic groups of humans, but ony ONE human race; and what a bunch of stupid monkeys we are.