Because the nobles who want to restore the country in history are all young and old. After the state of Qin was pacified, the Qin people were hunted down by Xiang Yu, and the nobles were looted. As a result, no one dared to say Qin, or even denied that he was a Qin person. After the Han Dynasty, Shu Han came into being. When Shu Han died, the world had been in chaos for more than one hundred years. The people are fed up with turmoil, and of course they are unwilling to continue fighting for the so-called Han family. The same is true in the Tang Dynasty. In a word, the feudal rule and revival of past dynasties are just slogans of rulers and dignitaries. As long as people live well, they won't care about these things.