The Nok and African Ironworking
In what is now Nigeria, the Nok were smelting iron by around 500 BCE and producing terracotta sculpture of startling sophistication — life-sized heads with pierced pupils and elaborate hairstyles. Whether West African iron smelting was learned from the north or invented independently is still argued; the furnaces themselves show local design. Iron tools cleared forest and worked hard soil, and the technology moved south and east with the Bantu migration, remaking African agriculture centuries before any European arrived.
A new technology destroys and creates work faster than institutions and people can adapt, producing dislocation and backlash.