1. After the reunification of Qin, General Meng Tian was sent to the northern expedition to the Xiongnu, and the Great Wall, which started from Lintao in the west and ended in Liaodong in the east, was built.
2. Qin Shihuang sent people to dig a Lingqu, which connected Hunan water and external water and connected the two major water systems of the Yangtze River and the Pearl River;
3. The measures taken by the Qin Dynasty to consolidate unity and strengthen the rule played an important role in the history of our country, ending the feudalism since the Spring and Autumn Period and creating a new situation of unity;
4. Since the unification of the Qin Dynasty, the feudal society of China for more than two thousand years, although there was a state of separatism in some periods, unification has always been the mainstream of history.