The great kingdoms of West Africa became powerful by

A succession of three great kingdoms came to power as their peoples gained control of valuable trade routes in West Africa. Ghana (GAH- nuh) was the first of these empires, followed by the kingdoms of Mali (MAH-lee) and Songhai (SAWNG-hy). Historians think the first people in Ghana were farmers along the Niger River.

Explanation:

answer; the values, beliefs, and assumptions about appropriate behavior that members of an organization share;

answer; list;