Answer:
Ghana was the first kingdom to take control of the salt trade.
Though much has changed, the basic needs of human society have remained constant throughout our history.
They offered defensive positions and safety to the people. They were also where the Lord lived and where the lord was is where the money was. Thus trade and economic prosperity happened around the castle. Many trades were needed to support the lord and his castle. The lords army had to be equipped and fed. Thus markets and tradesmen were needed to support the lord and his castle.
