It’s a genetic/evolutionary/cultural/socioligical issue.
This book review articulates the places where Wade may be overreaching.
I do believe it is a worthwhile area of inquiry. Ethnic/racial differences do exist and to deny the obvious for political correctness is just another example of the tyranny of the bullies.
However there are places where Wade is stretching his hypothesis.
I also have my doubts about any evidence of “evolution” in the short-term. I don’t believe behavior or cultural changes are “evolution.”
Charles Murray, the book reviewer, is a scholar in his own right, a very effective chronicler of educational/economic/social/cultural/ethnic trends.