US and British Blacks get a 6-9 point IQ boost somehow just from living in the West. In US Blacks, their skulls even got better. There may also have been some epigenetic changes, as US Blacks now seem to have a phenotype or even genotype IQ of ~85. When US Blacks came here, they probably had ~70 IQ’s. If US Blacks would have stayed in Africa, they would probably have ~70 IQ’s. White admixture only explains six points of the difference in Black-White IQ’s in the US and only one point of the seven point B-W difference in the UK. The other nine points in the US and six points in the UK are completely unexplained.
IQ Scores Before and After Western Move On arrival After West US Blacks 70? 85** British Blacks 79 86***
* Move to the West means different things for US and UK Blacks. In US Blacks, Before West refers to the intelligence of US slaves in Africa before they were enslaved and shipped to the West. In the UK, it refers to the mass movement of Jamaicans to the UK, mostly occurring soon after WW2. Before West means their IQ’s in Jamaica last century before they moved to the UK, and After West is the scores of the children of the original immigrants who were born and raised in the UK.
** Six points of the 15 point increase in US Blacks can be explained by White admixture, assuming US Blacks are 20% White.
** *Note that one point of the seven point Black increase in the UK may be due to increased White admixture acquired in the UK. Jamaican Blacks seem to be 9% White, and UK Jamaican Blacks are 13% White.