What contributions did Qin, Han and Wei Jin make to the Chinese Empire?

The Qin Dynasty was the first country in ancient China to establish a centralized feudal system, and it was the beginning of feudal society in China. It laid the foundation for today's Chinese territory, unified China and avoided the situation that China became a country like Europe. Unified writing in culture and unified measurement in economy. The Han Dynasty consolidated the rule of the feudal centralized state, and one of the most important political heritages of the Han Empire was the county system. Culturally, the movement of cultural integration centered on Confucianism has never stopped. China's civil service system accepted the ideal of Confucian culture, and attracted government talents by examining their ability and virtue, rather than their birth status. This system is still used after nearly two thousand years. China people still call themselves "Han Chinese", and they are deeply proud that they are the inheritors of typical China culture and the great imperial tradition established for the first time in the Han Dynasty. Zu Chongzhi, Jia Sixie, Pei Xiu, Li Daoyuan and others made scientific and technological progress in Wei and Jin Dynasties. 2. Further development of Buddhism and Taoism. Literature connecting the preceding with the following. Complete the transition from four-character, five-character, Sao style to seven-character poem. Yuefu poems are extremely popular. 4. The shining art.. Calligraphy by Zhong You, Wang Xizhi and Wang Xianzhi Cai Yong; Cao Buxing, Gu Kaizhi and other paintings with religious colors; The development of cave temples is like Yungang Grottoes in Datong, Shanxi, and Longmen Grottoes in Luoyang, Henan. Politically, do the right thing.