Malnutrition causes a lot of low IQ’s in Africa, so don't use a cohort from there either.
The leading lights of Darwinism all used the same argument against the Irish and Jews in the early 20th century.
and of course, IQ measurement only measures one type of intelligence and is culturally biased.
“IQ measurement only measures one type of intelligence and is culturally biased.”
Well at least you admit that it does measure one type of intelligence.
As to it being culturally biased, it absolutely is not.
Check this out... You may find it informative.
https://www.youtube.com/watch?v=J4KNnRBUhGo