It's a lot more than skin color
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I was listening to this excorcist talk on youtube, and apparently one of the effects of repeated sin is literal retardation, since sin is inherently illogical and eventually the reprobate will start becoming unwilling to process reality because they would have to admit they are evil. I wonder if its a coincidence that the continent with the most savages (which is an advanced form of reprobation relating to the sin of wrath) is also one of the *stupidest* continents. Its also observable in white society, as it has gotten more sinful and degenerate, mental illness has skyrocketed and retardation has become more commonplace.