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Again this is not an issue of race it's an issue of environment. If you visit sub-saharan africa you'll see exactly why IQ is not highly valued. Black Americans/Europeans etc do not live in Africa. If a high IQ is attractive, and a gap is present as a result of that history, it will close with or without interbreeding.

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You're mixing up a couple of different factors here. One is that it is highly debatable what IQ actually measures. Most of the evidence that I've seen suggests that it measures a mixture of mathematical intellignece and education. You can teach people how to do better in an IQ test - it's not an inate quality. This suggests that the quality of education people recieve will effect their average IQ scores. Education in sub-Saharan Africa is by far the worst in the world and this is due to factors outside the control of individual Africans.

Second, all types of intelligence are always selected for in every society. The simple fact is that you need far more wits about you to survive in the poorest parts of the world than you do in the richest.

The real problem for sub-Saharan Africans is that most of them spend so much time surviving that they don't have any left over to create or educate themselves in the types of abstract problems posed in a typical IQ test.