Access to schooling etc can't be the whole story: "black students from prosperous families tend to score higher in IQ than blacks from poor families, but they score no higher, on average, than whites from poor families".
Raven's Progressive Matrices is often administered. Is that test culturally biased? Does that test measure only ability to take that test and nothing else?
> The right thinks there is a cultural problem to be solved.
That's also the left. The right holds the differences are genetic, not likely to change, and the only problem to solve is how to keep them out of the country.