>>528150873
No pre-contact sub-Saharan African society ever created a written language, or weaved cloth, or forged steel, invented the wheel or plow, or devised a calendar, or code of laws, or any social organization, or formal religion, or system of measurement, or math, or built a multi-story structure or bridge or sewer, or infrastructure of any kind, and they never harnessed a river, or even drilled well or irrigated, or built a road or railway or sea-worthy vessel, they never domesticated animals, or exploited underground natural resources, or produced anything that could be considered a mechanical device.