The correct answer to this open question is the following.
The ethical system that the Qin Dynasty used in order to unify China was Confucianism and its ideas of personal responsibility and growth.
After many years of only being interests in profits and being rich, the Qin Dynasty put emphasis on ethical values that were established by the traditional ideas of Confucianism.
In the first place, we have the case of responsibility of the individual n everything it does. High morals became more prominent than individual richness. The nation had to be rich above all. Ethics and ethical conduct during the QIn Dynasty were aimed to support social development creating harmony with all that existed.
