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I think the traditional counterargument is "regression to the mean". If you randomly import smart Africans that pass your IQ test, there's no guarantee that their children will maintain the same level of IQ. You need to look at multigenerational IQ, ideally looking for specific groups that are identified as unusually smart in their host countries. Not every smart Israeli, but Ashkenazim, not every smart Indian, but Tamil Brahmins, not every smart Nigerian, but Igbo.
Is there an ELI5 on regression to the mean? How do a 150 IQ person's genes know whether to regress to 120 or to 90?
It's not an ELI5, but Emil Kirkegaard has a neat "contra unbounded regression towards the mean" article. https://www.emilkirkegaard.com/p/selective-migration-and-regression
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I'll take a wild guess and say it's random chance, and the mean of the population has the highest chance of manifesting in the individual.
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