It is suggested that the situation and combat power of each country should be considered.
In fact, before the battle of Changping, the situation of four great powers was similar: Qin first, Qi second, Zhao third and Chu fourth.
The situation here is roughly divided into national strength, combat power and domestic political situation.
After the battle of Changping, Zhao was almost completely annihilated, and the cavalry, the strongest fighting force of Zhao, was also exhausted. This was one of the few troops that could compete with the archers of Qin.
After the war, Qi was more determined not to participate in the war, and the internal chaos of Chu became more and more chaotic. In addition, after the battle of Changping, the six countries will be completely fine.