The Mongolian Empire is a great empire spanning Eurasia in history, an extension of the former Great Mongolia, and one of the largest empires and countries in the world in history. The largest territory of the Mongolian Empire is as high as 33 million square kilometers (12.7 million square miles), accounting for 22% of the world's land area, more than one-fifth of that of the Soviet Union in the 20th century. However, in 1260, the Mongolian empire was divided by Kublai Khan's struggle with Alibaba. 1264 After Kublai Khan (that is, Yuan Shizu) defeated Ali Buge, the fiefs of Empress Shu Chi, Empress Chagatai, Empress Wokuotai and Kublai Khan's brother Xu Liewu belonged to Mongolia and gained de facto independence. 127 1 year, Kublai Khan named the country "Dayuan", and the Yuan Dynasty was established in the Central Plains of China under his control (including most of China and the Mongolian Plateau). It is called "Dayuan State" in Mongolian. Coexisting with the Yuan Dynasty were the four great khanates that ruled Central Asia, West Asia and Eastern Europe, and the latter was separated and in an independent position. Except the Wokuotai khanate, which later perished and was hostile to the Yuan Dynasty, the other three khanates were nominally vassals of the Yuan Dynasty, and their actual independent status was also recognized by the Yuan Dynasty court. The original "Great Mongolia" no longer exists. Finally, the four great khanates gradually split into other small khanates. The Yuan Dynasty perished in 1368, when Zhu Yuanzhang, the founding emperor of the Ming Dynasty, and four subsequent khanates coexisted with other divided khanates for a long time, until all khanates, large and small, perished in16th century.