The document provides information about four ancient African kingdoms:
1) Ghana was a powerful kingdom located in West Africa between 1000-1100 AD that grew rich through trade along rivers and taxing traders.
2) Mali rose to power after Ghana's decline, led by the powerful king Mansa Musa in the 1300s AD who built mosques and spread Islam through West Africa.
3) Nubia was located along the Nile River in northern Africa and shared cultural traits with ancient Egypt, building pyramids as tombs but on a smaller scale.
4) Songhay conquered Mali's lands in the 1400s AD under Sunni Ali and became a wealthy kingdom centered in Timbukt