Title: This is more tricky
Review: Nurture can take many generations. In Poland (from where I come)there is a striking difference between rural areas which were under serfdom and which were under the royal or Church adminstration. The last two were much more humane and benevolent.The former serfdom areas have much more problems with crime, poverty and broken familes. The race in all areas is identical.Second issue is the genetic dynamic of population, withing one racial group the differences are larger than averages between different races. In a relatively short time (maybe few generations) different reporoduction rate can lead to significant shift. BTW, at present more academically gifted people have much fewer children so the natural selection pressure can end in leveling IQ down :).
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