During the Warring States period, Mencius inherited and carried forward Confucius' theory and put forward the theory that "the people are the monarch, and the monarch is the second".
In the Qin Dynasty, Prime Minister Li Si put forward the idea of unifying thoughts, and the first emperor burned books to bury Confucianism, which led to the loss of a large number of classics and the decline of Confucianism.
During the period of Emperor Wu of the Han Dynasty, Dong Zhongshu, the minister, put forward the idea of "ousting a hundred schools of thought and respecting Confucianism alone", thus confirming the orthodox position of Confucianism.
In the Song Dynasty, Confucianism was further developed and Neo-Confucianism was put forward, also known as Zhu Cheng Neo-Confucianism (Cheng Yi, Cheng Hao. Zhu. )
Wang Shouren, a general and scholar in Ming Dynasty, further developed Confucianism and put forward the theory of mind and nature. The mind advocates the unity of knowledge and action. Xue Xin is very different from Neo-Confucianism, but both are the development of Confucianism. )