What is race? Whether you believe in evolution or creation (which I do), you have to realize that all "races" today evolved (micro-evolution) from a single race. As humans migrated to different parts of the earth and were subjected to different climates, diets, altitudes, selective breeding within their own groups, etc. - the different races we have today came to be.
I firmly believe that should the world continue for another 100 years or so, that globalization and (so-called) inter-racial marriage will cause humans to evolve back into a single race.