>>41
Fair enough, but this doesn't escape the fact evidence of lack of evidence was found by those searching for evidence of civilization. You see just as there are known knowns, unknown knowns and unknown unknowns, there are also known unknowns, this is the definition of the enigma that is the black man.
There has been legitimate and extensive research done on African civilizations, and there were African civilizations, primarily cattle cultures which organized during the 15th century into the Ashanti, Mali and Songhai, as well as ancient Ethiopia and eastern afro-arab trading posts. The civilizations however are distinctly lacking in many respects, especially recently with new light shone on the issue by Jared Diamond's work "guns, germs and steel" which illustrates that despite negro exposure to old world crops, cattle and technology they failed to adapt these practices and the species themselves to their environment and construct civilizations to a similar level of sophistication until late into the medieval era. Meanwhile the mesoamericans achieved superior levels of intensive farming, trade and urbanization without important innovations that the arabians brought to the dark continent 1000s of years before such as iron and wheeled carts.