Comparing Blacks in Africa to Blacks in America on this basis is not fair or a valuable exercise.
First, there are just so many more Blacks on the continent of Africa than there are here; you will find more geniuses, great athletes, and beautiful people than you will find here -- simply because of the larger talent pool in Africa. Of course much of that talent will never be realized because of poverty, but this is true here as well.
Second, the African you find here are a biased sample. These are often the most wealthy, educated, and privileged. Even if they come here improvised -- they are still exceptional because they are highly motivated and passed muster with US immigration.
What do ya'll think?