They aren't descended from Cro Magnon, the predecessor to modern man. Instead, they have 19% Homo Erectus DNA. The skull of Homo Erectus has similar features to the average black person - a jutting jaw and a sloping forehead, which leaves less room for their small prefrontal lobe. The smaller lobe accounts for the low IQ and lack of impulse control in black people. This results in violent behavior and an inability to plan for the future. And it explains the rampant poverty in Africa. Even the most basic of tools the wheel, had to be introduced to their culture. Africa is surrounded by water, but they never thought to make dugout canoes.
Africans were given the means of irrigating crops, but the equipment fell into disrepair due to lack of maintenance, the parts sold off instead of being used to keep the equipment working. It's the same with seeds for farming. Africans will sell the seeds instead of planting them in order to have food the next harvest season.
They are hopeless.