American Blacks are 80-85. Sub-Saharan Blacks are 70.
The Minnesota Transracial Adoption Study looked at black kids who had been adopted, as infants, by middle-class to upper-middle-class white families. The purpose was to study the effects of environment on IQ. The study found that, even being raised from infancy by affluent white families, and going to school in good schools, the average adult IQ of the adopted black kids was just 89.
I have not heard of any further studies done.
Apples and oranges
If you can't see the obvious explanation for that contradiction, you are in denial.
I was able to have input at a different site when this thread was pulled earlier, and I will repeat just one of two thoughts here.
It has been demonstrated ad nauseam that closed societies tend to degenerate biologically. Even Caucasians.
The most dynamic and inventive societies are genetically heterogeneous. Why must we accept that African tribal societies (closed, by definition) are immune to that biological discovery?
(I was called a racist and neo-nazi enabler for pointing that out (in between a whole lot of cursing).)
I hope Free Republic represents a more informed and rational population.
I will leave it at that.