How did trade impact the development of the west african kingdoms

Trade impacted the development of the west African kingdoms:Trade affected the advancement of West African countries in the region. They had resources like salt and gold and West African kingdoms taxed all exchange convoys stretching their provinces. Trade participated in the increase of states that used trade to transport pepper, slaves, salt and ivory with other countries. They had their commerce with the European countries and Portuguese were one of the main suppliers and takers.The supplies played role in the development and helped merchants and citizens

Couldnt find one from xxx but its close 'egovert & kil- hey! ' its pretty gr8