I finished my review of the data. Read the latest version here. I can now with confidence say that I am convinced that the Black-White IQ gap in the US is probably more genetically conditioned than not. I based this on the following:
(1) Given the within group heritabilities, the a prior probability that a random sub-populational difference of this magnitude is more genetic than not, is over 50%.
(2) The data is consistent with a genetic hypothesis. I have not been able to find one inconsistent piece of evidence. And I can confidently say that I have looked at every counter-argument rendered.
(3) The data is not obviously consistent with any known environmental hypothesis. And making it consistent requires numerous ad hoc additions (e.g., “cultural g,” as discussed.)
I am delighted to conclude that I am finished — for now — with this specific aspect of the issue.