What positive did the ancient Chinese gain from the unification of the country into a single state?

Wars between the inhabitants of this country stopped, a unified system of measures and weights, a monetary system was adopted. This made it easier for people to trade. Good roads have been built.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.