According to Sima Qian's Records of the Historian, in 22 1 BC, Ying Zheng, king of Qin, unified the six countries, and in order to change the disadvantages of the last three generations, namely Xia, Shang and Zhou, he established this autocratic centralized system. It contains two parts: absolutism and centralization. The former aims at relative power and imperial power, while the latter mainly solves the contradiction between the central and local governments.
In short, the system initiated by Qin Shihuang raised the status of imperial power to an unprecedented height.
At the same time, it has greatly weakened local power. Coupled with his supporting measures in culture, transportation, economy and other aspects, such as unified measurement and the construction of Kyushu Chidao, China has been firmly solidified into an organic whole. Although it has been invaded by foreign countries for many times, it has never erased the brand of China.