The Yuan Dynasty was so powerful, why did it return to the grassland in less than a hundred years?

The Yuan Dynasty was a dynasty in which a few people ruled the majority. Compared with the Manchu dynasty, they did not adopt the policy of wooing the Han elite, but adopted the policy of compulsory repression and violence. In order to suppress the resistance, dozens of people even share a kitchen knife, which can't solve the problem. The racial discrimination was not covered up, so that the resistance of the Han nationality had no internal friction (Manchu suppressed the resistance of the Han nationality all the way to the later period, which directly led to the collapse of Mengyuan in a short time).

In addition, the diplomatic environment is also an important factor. Mongolian empire is a loose empire. After Genghis Khan's death, the empire collapsed and split into several khanates, among which the Yuan Empire was regarded as the orthodox heir (Tuo Lei was the first line, and the Mongols had a young son to inherit the family business), while other dissatisfied khanates formed an "anti-Kublai Khan alliance" headed by Haidu, which meant that the Mongolian empire across Europe and Asia was not Kublai Khan's help, but his opponent. These opponents posed a great threat to Kublai Khan's rear grassland, and also had a great influence on the hearts of Mongolian nobles, which indirectly led to the failure of Mongolian Yuan.