[Causality1]

There exist humans who are fifty IQ points smarter or dumber than other humans who also exist.

Sure but they're not all in the same ethnic group. What if a populous group had the peak of their intellectual curve far down the range? If, say, Gauls/French people were almost entirely simpletons equivalent to someone with Down Syndrome? Would they be enslaved and turned into a worldwide servant class? Every other group that were thought of as being inferior can be demonstrably equal to their oppressors but I think a world in which they weren't could be very different.

[mr_toad]

> What if a populous group had the peak of their intellectual curve far down the range?

It takes a long time, an evolutionary timescale for that sort of difference to emerge. There’s an argument that the reason that modern humans are so homogeneous is because we wiped out all competition long before we had recorded history or civilisation.

[haihaibye]

That's not a hypothetical, many Pygmies are currently enslaved

https://mankindquarterly.org/archive/issue/51-4/2

[rebuilder]

The thing is, when humans conquer a rival group, we tend to rape the survivors. That kind of ensures genetic mixing, so this kind large discrepancy in innate ability couldn't really appear.