Final answer:
The Mongol Empire collapsed due to internal conflicts among Genghis Khan's descendants and the devastating impact of the Bubonic Plague.
Explanation:
The main cause of the Mongol Empire's collapse was the perpetual infighting among Genghis Khan's descendants. By the middle of the thirteenth century, succession issues led to a civil war and the division of the empire into separate realms, leading to conflicts between them. Additionally, the Bubonic Plague decimated the population and disrupted trade along caravan routes, contributing to the empire's decline.
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