All that needs to be said is that a major factor in the IQ of a new born child is the genetics he inherits from his parents.

If a brilliant white man and a brilliant black woman have a child, there is an excellent chance that child will have a very high IQ and be extremely intelligent.

With this said, if a particular race already has a higher overall IQ (and this has already been tested) then it follows that the offspring of this race will ALWAYS retain the higher IQ based on genetics.

Someone made a point earlier about different breeds of dogs, and I think it is exactly the same here. Some dogs are more athletic than others and other dogs are much more intelligent than others. I see no reason why this cannot also be true in humans.