Which contributed most to the growth and power of the West African empires of Ghana and Mali?

Caravan trade

Caravan trade contributed MOST to the growth and power of the West African empires of Ghana and Mali. The gold-salt trade in Africa made Ghana a powerful empire because they controlled the trade routes and taxed traders. is it good enough

Explanation:

a. the moon was locked into orbit by the earths gravity as it was passing by and capture hypothesis i think

answer; sutherland-differential association;