Which 3 kingdoms thrived in this area & how were they ruled?

A succession of three great kingdoms came to power as their people, gained control of valuable trade routes in West Africa. Ghana​ was the first of these empires, followed by the kingdoms of ​Mali​ and ​Songhai​. Historians think the first people in Ghana were farmers along the ​Niger River​.

Explanation:

i would say the executive branch is because the executive branch is in charge of enforcing the laws and judicial branch is in charge of enforcing but the executive branch is most responsible for it all so i would have to say the executive branch.