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Higher IQ's will propogate where having a high IQ is advantageous.

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Such as Europe and North Asia during the ice ages?

OK so I'm joking, but to convince me of your theory you'd have to convince me that intelligent people have more kids than your average joe. Is there any evidence of this, because it's not the case today.

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And there are numerous studies to the effect that this gap has been closing for decades.

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Yes, it's called interbreeding, which presumably has happened a lot more since America ended Apartheid. And the gap hasn't closed that much - see the graph in wiki.

And finally there's the point that poor Africans do horribly at IQ tests - just above retard - whereas poor Indians, Chinese, Middle Eastern, you name it get normal scores (in fact some do better than white scores). Go figure.