Final answer:
Millions of people in East Central and southern Africa speak languages stemming from the Bantu, who migrated from Western Africa, bringing linguistic and cultural changes.
Step-by-step explanation:
Millions of people across East Central and southern Africa today speak languages that developed from the language introduced by the Bantu who migrated from Western Africa. The Bantu migrations were a millennia-long expansion of Bantu-speaking peoples southward from West and Central Africa, and their movement had a profound impact on the region's cultural landscape, particularly in terms of language, agriculture, and ironworking. These migrations saw the dissemination of a shared cultural foundation and culminated in the establishment of various medieval kingdoms in the region.