Qin Shihuang did not destroy all the countries. In fact, the state of Wei was destroyed only after Qin Ershi ascended the throne. Not because, just because it is too weak, it has been destroyed several times and revived under the favor of Qin State. Later, I had to take refuge in Qin, so I became a vassal state of Qin a long time ago, and Qin did not need to be annexed by force. It was not until the second year that the country officially perished, and then it could be said that there was a real formal unity.

As for the kingdom of Zhongshan mentioned by the master, it is actually quite famous. Although the country is not big, at least people left it a volume in the Warring States policy. Sun Yixian was founded by the northern fairy clan in the Spring and Autumn Period, and reached its peak in the Warring States Period, becoming a powerful country second only to the "Seven Heroes in the Warring States Period", but its historical records are lacking. During the Warring States Period, Zhongshan State was located in a small area of Zhengding and Shijiazhuang in Hebei Province. Although Sun Yat-sen is a small country, it was jointly established by the nomadic people in the north and the Chinese nation. It is very strong, but it can stand on its own feet even if it is surrounded by strong neighbors. It was founded two or three hundred years ago, until it was destroyed by Zhao in 296 BC. During the Warring States period, Sun Yat-sen became an ally with Yan State in the north and Qi State in the east, and lived in peace for a long time. However, Zhao and Wei in the southwest regard it as a worry.