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What about asians? There seems to be a lot of effort being put in to come up with explanations for the worse scores of blacks. It seems like occam's razor is being ignored given that there are large, significant test score gaps between 4 different racial groups, not just a gap between one race and the other three.
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The scores Japan, South Korea etc. are about the same as for Germany and several other European nations. Also, ST works both ways; if you tell people that their ethnic group is expected to perform better, then they will. Asians have a stereotype of being 'smart' in the US.
The UK education experience is interesting here. India is reported to have IQ scores in the low 80's. However, Indian children outperform white children at school in the UK. Meanwhile, Pakistani and Bangladeshi children - who are ethnically the same as many Indians - perform much worse than white children. And white Irish children outperform white British children, even though Ireland scores as low as 93 according to
IQ and the Wealth of Nations. (
link on UK education)
There seem to be many factors affecting the performance of ethnic sub-groups. Genetics may be one but I don't think that's clear.