1, the reason of the ruling class:
The conservative ideas and systems of rulers can't meet the needs of productive forces. The rulers not only don't want to reform the malpractice, but also make great efforts to build houses and get close to treacherous court officials. For example, Jie before Xia Wu was blackmailed by Zhou Dynasty.
2. Causes of natural disasters:
Natural disasters such as earthquakes and droughts have caused great losses to people's lives and property. These phenomena, which could not be scientifically explained in ancient China, were all interpreted as astronomical phenomena before the demise of the dynasty. People's hearts are unstable, and the ruling class also increases taxes and corvees. The most typical dynasties are the Western Zhou Dynasty, the Yuan Dynasty and the Ming Dynasty. Natural and man-made disasters have occurred one after another, resulting in a large increase in the number of refugees and continuous uprising for survival.
3. Reasons for political decentralization:
The eunuch consorts of the dynasty expanded, the emperor became younger, the queen mother came to the DPRK, the consorts took power, and all parties fought endlessly for their own interest groups. For example, during the Jin Dynasty, Emperor Hui of Jin was unable to control the overall situation, and internal struggles among the major forces of the imperial court led to the rebellion of eight kings and later the rebellion of five kings. In the Ming dynasty, the eunuch party was dictatorial, and the right was above the imperial power.
4. Institutional reasons:
Imperfect policies and laws in Qin Dynasty, cruelty of criminal law, serious lack of government operation and local power led to peasant uprisings in Chen Sheng and Guangwu. The hierarchical system of Yuan government led to oppression of people, financial deficit and bankruptcy of government credit. In the Ming dynasty, the civil service group monopolized the government and eunuchs, and the government restricted the circulation of commodity money. The Qing dynasty closed its doors to the outside world, followed the ancestral system blindly, and its ideology and technology were seriously backward.
5, class contradiction:
The replacement of many dynasties in history is mainly due to class contradictions. For example, the contradiction between the peasant class and the ruling class is the main reason for the final demise of many dynasties. For example, at the end of the Qin Dynasty, Qin Ershi and Hu Hai were unable to govern Zhao Gao, which led to the situation that treacherous court officials were in power. Due to the construction of the Great Wall, people's life has become difficult, but now, under the influence of tyranny and chaos, great class differences have been formed.
6. Reasons for invasion by foreign powers:
A dynasty not only has the influence of its own country, but also has the interference of external countries. In the face of foreign eyes, once you are weak or seriously backward, you will face the fate of being beaten. This is also obvious in the history of China, such as the Song Dynasty and the Qing Dynasty.