IQ differences by race in the US.
(twitter.com)
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By that logic, 140 years the other way didn't change their genetics that much, either.
You're comparing 30,000 years of evolution to seven generations, at most, of artificial selection, and that assumption requires you to believe that a majority of slavers kept the women locked in a pen like a herd of cattle and occasionally brought in a bull, when we know this was demonstrably untrue. Slaves can and did form relationships of their own free will (to the extent that picking from an artificially-limited pool of potential mates constitutes free will). Those who escaped bondage told and wrote stories about it, as did those who helped them.
genetics is not linear, it changes in response to stress, not time.
jews changed genetically a lot in a matter of a few centuries because they kept getting hit with pogroms.
Does a pogrom cause additional mutations to form, or make it more likely that said mutations are beneficial?
it's that the smarter jews escape while the dumber ones do not.
have that happen over & over & you'll end up with a skewed population.
The dumb ones don't incite pogroms, so you've got competing impulses.