I've never really thought this stuff through to any solid conclusions. Race certainly exists, but I think it's fairly trivial. Mostly cosmetic. There hasn't been enough time since the first appearance of
Homo Sapiens for any significant speciation-type of divergence. And now that we can easily travel the globe there will probably never be such divergence. (Biological divergence will happen, given interstellar travel and settlement, because the distances between groups of humans will become too great to circumvent, but that's not our problem today.)
Most of the behavioral differences attributed to race are probably cultural. IQ differences are ridiculously irrelevant. The average IQ of my race is as meaningless to me as the average IQ of my zip code. Race is the playground of politics more than any other discipline.
The average IQ of my race is as meaningless to me as the average IQ of my zip code. Well, I've noticed that the people most convinced their own race is more intelligent are usually the ones holding up the low end of the Bell Curve :-). I've never met a White Supremacist who wasn't dumb as a rock.