
IQ and the Wealth of Nations is a 2002 book by psychologist Richard Lynn and political scientist Tatu Vanhanen. The authors argue that differences in national income are correlated with differences in the average national intelligence quotient (IQ). They further argue that differences in average national IQs constitute one important factor, but not the only one, contributing to differences in national wealth and rates of economic growth.
This shouldn't be necessary, but I probably need to point out that not every single black person has a lower intelligence than every single white person. It's just the average. Some black individuals have higher IQs than some white individuals, of course. Which means that solutions like segregation/apartheid are ham-fisted and totally unfair to these high IQ blacks.
For more info on the IQ and race thing, I recommend the book IQ and the Wealth of Nations by Richard Lynn and Tatu Vanhanen.
I'm not making any other claim than that specific one: there is no such thing as "national IQ averages". If you claim there's some other kind of "IQ average" that isn't "national", you're addressing a point I didn't make.
Really, the more you think about that theory, the dumber it gets.
Anybody claiming to have a simple answer to the question you posed has to grapple with two big problems:
1. There has never been a global study of IQ across countries or even regions. Wealthier countries have done longitudinal IQ studies for survey purposes, but in most of the world IQ is a clinical diagnostic method and nothing more. Lynn's data portrays IQ data collected in a clinical setting as comparable to survey data from wealthy countries, which is obviously not valid (he has other problems as well, such as interpolating IQ results from neighboring places when no data is available). (It's especially funny that Bing thinks we have this data down to single-digit precision).
2. There is no simple definition of "the major races"; for instance, what does it mean for someone to be "African American"? There is likely more difference within that category than there is between "African Americans" and European Americans.
Bing is clearly, like a naive LLM, telling you what it thinks you want to hear --- not that it knows you want rehashed racial pseudoscience, but just that you want a confident, authoritative answer. But it's not giving you real data; the authoritative answer does not exist. It would do the same thing if you asked it a tricky question about medication, or tax policy, safety data. That's not a good thing!