Judging from Marx's historical materialism, economy determines politics. When the economy is strong, it will naturally achieve political victory, and Shang Yang's political reform has played an important role.

But we should also see why Qin's reform alone improved productivity, because in a monarchy, the firmness of the king's political stance, the openness of employing people and the boldness of innovation all played a decisive role. At the beginning of the Spring and Autumn Period, Qin was a barbarian land, and the children of the so-called poor had already become masters. Compared with the kings of other countries, the kings of Qin all won a great victory, so Qin was able to unify the six countries.

But it doesn't mean that Qin can unify the six countries because it is located in barbarians. In the process of unifying the six countries, it was the tutors of the kings of Qin who cultivated their spirit of self-improvement. This is a completely accidental factor, and it may happen in other countries.

Therefore, it is not inevitable for Qin to unify the six countries, but it is also inevitable for China to be unified by a country with a family culture like Qin.