Since the battle of fishing towns in Song Dynasty led to the death of Khan Mengge, a large-scale civil war between East and West for Khan's position was launched for the first time in Mongolian Empire.

Although Kublai Khan of the Eastern Group won the civil war, it actually aggravated the internal division of the Mongolian Empire. Since the civil war, the relationship between Kublai Khan Group and the Western Khan Group has not been very good.

Later, Kublai Khan changed his name, implemented the bureaucratic management system of China law, and built most of them to settle down. To some extent, it is also because he knows that other great Khan countries refuse to accept himself, and the Eastern Group needs a new way out. The brand of Mongolian Empire exists in name only.

Later history also proved this point. The Yuan Dynasty and the Four Great Khan Countries perished one after another and did not support each other. They don't look like people from the same country at all. Have you ever heard that part of your country was attacked while other areas stood by and watched this area occupied? ]

As early as after Mongo's death, the East and the West of the Mongolian Empire have never been truly unified, and it is only an inevitable outcome to go their separate ways and perish.