African Americans advanced civilization during the middle ages:
The Kingdom of Kush--- Though often overshadowed by its Egyptian neighbors to the north, the Kingdom of Kush stood as a regional power in Africa for over a thousand years. This ancient Nubian empire reached its peak in the second millennium B.C., when it ruled over a vast swath of territory along the Nile River in what is now Sudan
The Land of Punt--- Few African civilizations are as mysterious as Punt. Historical accounts of the kingdom date to around 2500 B.C., when it appears in Egyptian records as a “Land of the Gods” rich in ebony, gold, myrrh and exotic animals such as apes and leopards. Egyptians are known to have sent huge caravans and flotillas on trade missions to Punt
