Who cares. The people that remained in Africa, along with their Aboriginal cousin, became the primitive people in the world while others developed civilizations and made huge advances. Even the Maya, Aztec and Inca were light years ahead of sub-Saharan Africa without infusion from other civilizations.
Just because Blacks seem to have been in a perpetual primitive state in Africa doesnt mean ALL Blacks were. Here is a parallel that illustrates
how groups who look almost identical can develop socially and technologically in diametrically opposite ways
Indian Civilization was well established by the time Europeans arrived in South America. The great pyramids of Mexico had been built and, in some ways, Indian technology was superior to that of the invaders specifically in the field of astronomy. Even then, that which would later be called Mexico city was a sprawling metropolis.
Still, other Indians lived in and roamed the nearby forests; content to live a primitive lifestyle. Such tribes are still being discovered today. A closer look at photographs shows a phenotype similar to the civilized people in the cities.
My question is: Could the same phenomenon have happened in Africa? I believe the original people of KMT(Egypt) were Black and lived along side primitive tribes who looked just like them. In time, though, wars and other interactions with outsiders from Asia and Arabia diluted the Black gene pool and a race of mulattos emerged ... ensconcing themselves among the populace even unto the ruling elite.
Eventually the Macedonians conquered the new cosmopolitan KMT and the Greeks renamed it Egypt, symbolically erasing all connections with the original Black founders and the name KMT: an ancient name that means land of the Blacks.
Nevertheless, the Rulers of KMT may have been involved in Ocean expeditions. After all, according to scripture, they were brothers of the Phoenicians... the people of the sea!
Now before someone figures out the time lines don't match, let me say this. There is new evidence that suggests that the OLMECS thrived in the Americas as early as 3100 BCE... NOT 1200 BCE or 1500 BCE as recorded for posterity. That date would put them in the same era as the Black rulers of KMTand we have a new ball game!