Final answer:
The spread of the proto-Bantu people had a significant impact on future civilizations in Africa by introducing innovative practices and forming a common cultural framework.
Step-by-step explanation:
How did the spread of the proto-Bantu people affect future civilizations?
The spread of the proto-Bantu people had a significant impact on future civilizations in Africa. As they migrated, the Bantu encountered different groups with innovative practices in agriculture, animal husbandry, and metalworking. The Bantu borrowed and adapted these advancements, forming a common cultural framework across sub-Saharan Africa. This enabled the formation of complex societies, such as the medieval Great Zimbabwe, that later became dominant in the region.