The document discusses the migration of Bantu-speaking peoples in Africa from around 1 AD to 500 AD. It provides three key reasons for their migration: 1) their farming methods exhausted the soil requiring them to clear new land, 2) their successful farming led to increased population sizes and crowded lands, and 3) as they reached new areas they encountered other peoples and often took over the best lands. The Bantu-speaking peoples originated in Nigeria and spread throughout sub-Saharan Africa, bringing their language and culture with them.