The root cause of the demise of the six countries, I think, is the inevitability of history and the contingency of Qin's advanced mechanism. First of all, the six countries themselves are small countries, coveting comfort, have no plans to expand, and have not said who they will succumb to. If this is the case, it is understandable. After all, it is good to contain each other as neighbors, but what kind of country is Qin?

First of all, he promoted the military service system and effectively developed the military in this area. Once a country becomes strong militarily, it is bound to have certain ambitions. The first department is, of course, to expand its national status.

It is precisely because the mechanisms of the six countries are weak in all aspects that they are given the opportunity. Moreover, the six countries themselves are not United, and on the surface, they seem to be quite harmonious with each other. In fact, they are the plastic sisters we are talking about now. At the critical moment, Qin watched this very closely and began to sow discord.

In The Theory of Qin, which we have studied, it is said that "the disadvantage lies in bribing Qin", which means that the six countries are threatened by attack. When I saw Qin attacking other countries, my first thought was not to unite and fight together, but to bribe and please, and then let Qin keep my country, but I never thought that if Qin annexed all other countries, how could it keep the country?

It is their peace of mind and single-minded desire to keep themselves out of trouble that caused the final irreversible situation. This is a historical necessity. Even without Qin, it would leap out of another country.