system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why don’t you hear about the history of Africa before colonialism?

Why don’t we learn about Africa’s history before slavery? Was it not documented enough or is it just another systematic racism?
gpt
Egypt is one of the oldest civilizations on the planet and we hear a lot about them and their history prior to European colonial era. We also hear a lot about the Caliphate eras of the middle ages and dark ages which controlled much of North and Central Africa, and of Carthage that was in North Africa during the Roman era. 

But you are correct that there is not a lot on Central and Southern Africa. That would be because most of those tribal groups did not have written language so we do not have records of their history outside of oral traditions of the groups, or records of them made by other groups. 

Also you talk as though slavery was something unique to Imperial Europe and the Americas. It was not. Slavery has existed as long as civilization has existed and virtually every ethnic group on the planet has owned slaves and been slaves at some point in their history.