Why Thomas Sowell is wrong about IQ
(www.jollyheretic.com)
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He makes no such claim in this video. Around 1:30 he says "IQ...is partly genetic in nature." I've never seen or read him make such claims elsewhere either. As I said in my other post, genetics is a very strong predictor of IQ, no more no less.
I'm not familiar with any evidence of general population IQ jumps that large between the same genetic groups in different environments. The difference in American blacks IQ and sub-Saharan blacks is accounted for by the rather large European genetic admixture that blacks Americans have (that sub-Saharan blacks lack) combined with moderate increases that the Flynn Effect can cause in more industrialized nations, in other words blacks living in the US.
Caribbean and African black US immigrants regularly outpace the native US black population in IQ and that gap GROWS by every generation.