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At the beginning of the Jiashen period during the Ming and Qing dynasties, the three regimes of the Ming, Dashun, and Qing dynasties fought fiercely in China. After Li Zicheng defeated the Ming army in five battles in the Central Plains, he founded the country of Xi'an, divided his troops into two groups, and pushed directly towards Beijing, making him invincible. The ruthless Emperor Chongzhen's plans to save the crisis went bankrupt one after another. With no other choice, he hanged himself on Meishan Mountain, announcing the fall of the Zhu Ming Dynasty. The Dashun leadership group was satisfied with the victory they had achieved, forgot about it, and handled it inappropriately, which was exploited by the Qing Dynasty. Wu Sangui surrendered to the Qing Dynasty, the Dashun army defeated Shanhaiguan, and the Qing army marched straight in, using force to defeat the heroes and complete the unification of the country. From then on, the less civilized Manchus became the ruling nation in China, further strengthening imperial power and strengthening ideological control, which hindered the normal development of the commodity economy in China. As a result, the Chinese civilization, which had long been the world's leader, fell behind the Western world.