GVs (races in the old terminology)
But, 'race' is not exactly the same concept as 'geographical variant'. As I will further explain below...
The correlations between GVs are NOT vague but do vary on a continuum, demonstrating the falsehood of the modern claim that "human races are [reducible merely to] cultural constructs." But even if I accept this lie, why are Black IQs in the USA 15 points lower than White IQs?
Bingo! 'Geographical variances' occur on a continuum, whereas 'race' is a discrete concept. That is, if a census questionnaire or housing assistance application asks for my 'race', I am expected to provide a self-evaluation. The options are usually white, black or hispanic: choose one. Where's the continuum?
For people somewhere in the gray area between these options, how do they decide which box to check? Based on their cultural affinities, not based on some genetic test.
And so now we come to your favorite Leftist, the most quoted living intellectual of our day, Noam Chomsky. What does he think of racial differences?
When did I say that Noam Chomsky is "my favorite Leftist"? I'm my own favorite Leftist, to the extent that I'm even a "Leftist" at all.
Why don't you go ahead and tell us what Noam Chomsky thinks about racial differences, such as the oft quoted but hotly disputed IQ difference between black and white?