How did the Mongolian Empire come to an end? It was conquered by an army of Muslims from Baghdad. A Russian czar invaded China. It collapsed from internal fighting. It merged with the Mughal Empire.

The Mongol Empire did not come to an end through a single event or conquest, but rather through a gradual process of fragmentation and decline. It collapsed from internal fighting, succession conflicts, and the inability to maintain the vast territories under a single rule. After the death of Genghis Khan, the empire expanded significantly under his descendants but eventually fractured into various khanates. These splinters, such as the Golden Horde in Russia, the Chagatai Khanate in Central Asia, the Ilkhanate in Persia (modern-day Iran), and the Yuan dynasty in China, became functionally independent.

None of the suggested causes in the multiple-choice options (conquered by an army of Muslims from Baghdad, invasion by a Russian czar, or merging with the Mughal Empire) accurately explain the end of the Mongolian Empire. While there were indeed conflicts with Muslim states and internal strife, these were part of a broader tapestry of the empire's disintegration over time, not immediate causes for its collapse.