At first, the State of Qin was an extremely weak and small country, located in the western region, and was relatively backward in economic and military aspects, so that it was often ignored by the Central Plains states. However, such a weak princely state eventually became the hegemon of the Central Plains, and under the rule of Qin Shi Huang, it took only 10 years to sweep through the six kingdoms and unify the world and establish a great dynasty. The reason why Qin Shi Huang was able to lead the Qin state to complete the unification, in addition to his own strong ability, there is also a point, that is, he has a powerful father and ancestors. His ancestors have always been angry and strong for the sake of the strength of the Qin State.
First of all, the geographical conditions of the Qin state were extremely bad at the beginning, with the powerful State of Wei in the east, the State of Chu in the south, and many nomadic peoples in the west. It is actually not easy for such a Qin state to survive, but the ancestors of the Qin state have worked hard to rule and constantly find ways to strengthen the Qin state. Since Qin Mugong, it has continuously expanded its territory to the west, and by the time of Qin Shi Huang, the Qin state has reversed its geographical disadvantage into an absolute advantage, allowing the Qin state to attack and retreat. According to Bashu, it is possible to directly take Jingxiang down the river to capture the State of Chu, and from the east to send troops directly into Shanxi, capture Han Zhao Wei, and then try to take the land of Yan and Qi. In this way, the six countries were swept away and the world was unified.
Secondly, the ancestors of Qin Shi Huang established a complete centralized system. His greatest contributor was Qin Xiaogong, who at that time ordered the recruitment of sages in order to strengthen the Qin state, so there was the arrival of Shang Martin, and with the support of Qin Xiaogong, Shang Martin carried out reforms in a big way, comprehensively implemented the policy of "generous rewards and heavy weights", not only politically strengthened the centralized rule of the Qin state, but also economically, with military merit as the standard of reward, the field was transformed into a non-hereditary form, providing extremely favorable conditions for Qin Shi Huang to annex the world.
In addition, during the reign of King Zhaoxiang of Qin, the strategy of continuous transgression greatly provoked the relationship between the princes, so that the six eastern kingdoms were constantly fighting and containing each other, so that they could not free their hands to jointly deal with the Qin state. Under the strategy of long-distance and close attack, Han and Wei were gradually destroyed, and the Qin state had the potential to encroach on the east. In addition, in order to strengthen the centralization of power and consolidate the status of the monarch, King Qin Zhao gradually deprived the nobles of their great power. In this way, the regime of the Qin state tends to be more stable.
By the time Qin Shi Huang succeeded to the throne, his fathers and grandfathers had laid a solid foundation for him, making the Qin state already very strong in economic, military, political and other aspects. At this time, Qin Shi Huang only needed to stand on the shoulders of his ancestors, coupled with his own efforts, to make the unification of the Six Kingdoms of the Qin State inevitable.