How did the west African empires gain power?

West African empires, such as Ghana, Mali, and Songhai, gained power primarily through control of trade routes and valuable resources, particularly gold and salt. They established strong centralized governments that facilitated trade and collected taxes, which helped to fund their armies and infrastructure. Additionally, the empires benefited from agricultural surplus and the integration of Islam, which enhanced trade connections with North Africa and the Mediterranean. This combination of economic strength, military power, and cultural exchange contributed to their dominance in the region.