One significant migration triggered by the desertification of the Sahara was the Bantu Expansion. This migration involved the Bantu-speaking peoples, who originated in West Africa and began to move into the central and southern parts of the continent. They brought with them agricultural practices, ironworking skills, and cultural traditions, which had a profound impact on the development of societies in the savanna regions.
The desertification of the Sahara also led to increased interactions and trade between the people living in the savanna and those from other parts of Africa. Merchants and traders from the savanna would travel to the desert's edges to exchange goods with caravans coming from North Africa and the Middle East. This facilitated cultural exchange and the spread of ideas, technologies, and knowledge between different regions.