Final answer:
West Africa and parts of Central Africa were the cultural regions where Africans grew Indigo, linked to global trade routes and influenced by agricultural and economic changes.
Step-by-step explanation:
The cultural regions of Africans that grew Indigo include primarily West Africa and parts of Central Africa. These regions were known for a variety of agricultural practices and commodities, which linked them to global trade routes of the era. West Africa, notably, had vast and diverse landscapes, with some areas conducive to indigo cultivation. For instance, West African societies were able to domesticate and grow crops like rice, millet, and sorghum in the savannas, which implies that the knowledge and cultivation practices for Indigo could have existed within these societies. As such, areas of West and Central Africa were transformed by the slave trade, which heavily influenced their economies and agricultural practices.