Although west Africa was rich in natural resources, it experienced political instability when different tribes and kingdoms vied for control ove ther

Rice trade is the correct answer.

Explanation:

the foundation of greek city-states: following the fall of the mycenaean civilization in the 10th century bc, the area surrounding the empire went through its own mini dark ages. answer and explanation

according to worldatlas.com, the u.s. has an 86% literacy rate.