4. Abandoning the enfeoffment system and establishing counties and counties became the standard mode of management after the reunification of China, which lasted for thousands of years;

13. unifying currency and weights and measures will greatly promote domestic business exchanges.

4. The cars are on the same track and the roads are at the same distance. The construction of Qin Zhi Road greatly facilitates domestic traffic;

5. Burn the history books of the six countries, unify thoughts objectively, and avoid splitting the country due to historical problems; However, copies of ancient books destroyed in various countries were preserved, and the subsequent destruction was because Xiang Yu set fire to Qin Dou;

6. The construction of Lingqu strengthens the control over the Pearl River Basin, making this area the territory of China forever;

7. Building the Great Wall, an important line of defense against the invasion of the northern Hu people, has long been a national border;

8. Expedite to South Vietnam and bring Fujian, Zhejiang and Guangdong into Chinese territory.

9. Attack the Huns in the north and recapture the Hetao area, making this area the territory of China forever. So far, the basic pattern of China's unified multi-ethnic centralized state has been established.