Answer:
The Song created a true civil service system, which was based on merit. This system reflected Confucian ideals and showed great respect for learning. The Mongols ended the civil service system and had corrupt leaders. The Ming brought back the Confucian principles of government that had been lost during Mongol rule. Christianity was the official religion of Axum in East Africa. Islam began to spread along eastern coastal cities. The civilizations in West Africa practiced solely Islam. African civilizations contributed to metal working by learning how to smelt.