When introducing the reasons for the unification of the Qin Dynasty, the senior high school textbook "Ancient History of China" said: "The reform of Qin State is thorough, the country is rich and strong, and its strength exceeds that of any country in the East, which makes the unified war possible." Shang Yang's political reform really laid the foundation for the Qin State to merge with the six countries and unify China, but there are other factors for Qin Neng to unify the world, and the following points are also very important.

First of all, according to the relevant economic zones in China and Sichuan, Qin laid a solid economic foundation.

There have been two economic zones in northern China since ancient times, namely, Kanto Economic Zone and Guanzhong Economic Zone. Kanto Economic Zone (Central Plains Economic Zone) is the oldest economic zone, which was founded here in Xia and Shang Dynasties. However, with the increase of population, the contradiction between man and land is developing in an unfavorable direction. Without any change in backward wood and stone tools and production methods, it soon weakened. After the establishment of Shang Dynasty, it moved the capital several times. In addition to political reasons, the deterioration of natural conditions and the decline of economic zones are also important reasons. When the Central Plains Economic Zone was in decline, Guanzhong Economic Zone rose and developed rapidly from the early years of the Western Zhou Dynasty, showing great superiority and surpassing the old Central Plains Economic Zone in all aspects. The national economic center then moved from Kanto to Guanzhong. It is based on this transfer of economic center that Zhou succeeded in replacing Shang and realized the transfer of political center to Guanzhong. Since then, Wang Ping has moved its capital to Luoyi, but its economic center has not turned to Kanto. It was not until the Spring and Autumn Period and the Warring States Period that the Kanto Economic Zone regained its vitality with the popularization of ironware and Niu Geng and the popularization of irrigation and fertilization. Moving eastward and handing over the national economic center to Qin provided superior conditions for Qin's strength. Qin Xiaogong appointed Shang Yang to carry out political reform and implement a brand-new system, which fully mobilized the vitality of this economic zone. Coupled with the possession and management of Sichuan, it has formed the economic strength of "sweeping the world". Since then, history has proved that whoever owns Guanzhong will win the imperial industry. The economic root of Xiang Yu's defeat and Liu Bang's victory lies in Xiang Yu's loss of Guanzhong, the most important economic zone, which Liu Bang occupied. The capital of Sui and Tang Dynasties was still in Guanzhong, indicating that Guanzhong economy still occupied an important position in the country at that time.

Second, it is a historical necessity that the advanced defeats the backward and the Qin Dynasty is unified.

Compared with the six countries, Qin is the most advanced. The first is advanced productive forces. Among the archaeological excavations in China, the earliest iron unearthed place was in the land of ancient Qin; From the perspective of water conservancy projects, it is also the most prominent in the Qin Dynasty. Zheng Guoqu and Dujiangyan are world-famous grand projects, benefiting future generations. Advanced productive forces and the most ambitious water conservancy projects all appeared in Qin State, indicating that Qin State was the most economically developed and advanced region at that time, and therefore was also the most politically and militarily powerful region. Second, the social system is advanced. Since Qin Jianguo, he has been pursuing the advanced legalist thought of China at that time. For example, his thought of centralization, land to the tiller and rule of law. According to the Legalist theory, Qin established the centralized system with counties as the unit, the social production system with small households as the unit and the social distribution system with military achievements as the unit, all of which were adapted to the new productive forces represented by ironware and its new production relations and superstructure. It is these new systems that have injected new vitality into Guanzhong Economic Zone and made it an advanced model. Third, advanced culture. Compared with the six countries, Qin culture is the most advanced in any respect. The unification of the six characters of Qin Xiaozhuan is not a simple high-handed politics of Qin, but an advanced character of Qin. The word "horse" printed in the textbooks of the six countries basically belongs to the original picture characters, and only the word "horse" of Qin State is the most linear and abstract. Everything abstract is more general. Another example is the round square hole money, which is definitely the most convenient currency to use compared with the currencies of the six countries. It is a clear proof of the past dynasties. Shang Yang's new social system can't be implemented in the six countries, but realized in Qin State. Its root lies in the fact that the six countries lag behind Qin State, which has a strong demand for social development.

Third, the elite gathered, and Qin had the talent advantage.

Because of its advanced system and bold acceptance of talents, Qin once became a yearning place for social elites, and talents from all walks of life in the six countries gathered in Guanzhong. Many politicians, military strategists and diplomats were not used in the six countries, but were reused by Qin. Shang Yang was not used in Wei, and Qin Zhun was the phase; If it is not used, Qin will worship it; Zhang Yi was not used in Chu and Zhao, but Qin people used it to become Lian Heng ... and so on. In a word, Qin is a place where elites gather and talented people come forth in large numbers. With the continuous efforts of a large number of elites, Qin has the potential to "sweep the world" to eliminate the six countries and unify China.

Fourth, the superior geographical location provides good environmental conditions.

Guanzhong has been the land of four passes since ancient times: Donghan Valley, West Three Pass, North Small Pass and South Five Pass. The river is the river to protect the country, and the mountain is the mountain to protect the country. The six countries are connected by plains, and they are fighting endlessly. It is this superior geographical position that has become the natural environment for Qin to accumulate strength. In this superior environment, with the continuous efforts of several generations, Ying Zheng, king of Qin, destroyed six countries and unified the world in just ten years.