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The Mongols had a great impact on the post-classical world. Gunpowder was developed in China during the post-classical era. The Mongol Empire connected Europe and Asia, creating safe trade and stability between the two regions. In total the population of the world doubled in the time period from approximately 210 million in 500 AD to 461 million in 1500 AD. The Mongol empire spared teachers of taxation and led to the great spread of printing all over East Asia. They also helped the rise of an educated class in Korea.

Explanation:

a widespread disease that killed many people

the split of the christian church

invasion from arab muslims