The document discusses three West African kingdoms - Ghana, Mali, and Songhai - that showed the richness of Africa between the 3rd and 15th centuries. [1] Ghana developed as a kingdom along the Niger and Gambia rivers in West Africa between 300-1100 AD, growing wealthy through trade and tax collection. [2] Mali emerged as a major kingdom south of Ghana in the 1200s, becoming powerful through the gold and salt trades when resources declined elsewhere. [3] The greatest king of Mali, Mansa Musa in the early 1300s, further developed these trades and built mosques, demonstrating the kingdom's wealth and influence.