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That's clearly the case is contemporary society.

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This is very wrong and goes against the accepted wisdom. Dumb people have more kids, and have for a long time. See this reference - and there are many other more credible ones that I have read.

http://www.eugenics.net/papers/Intelfert.html

"This paper reports the results of the first analysis of the relationship between intelligence and completed fertility (as well as partially completed fertility) in the United States which employs a large, representative sample of the population. The major finding is that the relationship has been predominantly negative from 1912 to 1982."

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Interbreeding, what's your evidence of that? Would test participants of mixed race qualify for these kind of studies on race related IQ? I don't know the answer to that - but I'm guessing not.

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These aren't race related tests. They're tests for the military, school, etc where race is reported as a statistic along with other information.

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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.

[/ QUOTE ] You have a flawed understanding of reproduction in modern times.

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And just as a voice of reason, the gap isn't exactly very big as it is, and there's plenty crossover.

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The gap between 100 and 85 IQ is massive in modern society. An IQ this low makes you incapable of holding many middle class jobs, running a business, going to college, adequately planning for your future, educating your kids, or finding creative solutions to your social or economic difficulties. Let alone excelling in those endeavours. Why do you think there's so much crime amongst this race? Poverty alone doesn't account for it, not any more.

There is some crossover. But you generally need a reasonable IQ to be successful in modern life, and less than 15% of blacks have even an average white IQ. Such a large population of semi-retarded individuals (50% below 85) results in cultural and family problems as well, such as gangs, drugs, and seeing violence as a solution to problems.