I think it has something to do with China's culture and people's hearts. Because protracted war will inevitably lead to people's suffering, many people are looking forward to reunification, so after a certain period of war, people can no longer bear this kind of life, and will gradually accept the rule of the strong, and finally the strong will suppress the weak and unify the country. In addition, there are cultural factors. Although Chinese dynasties experienced numerous wars, from a very early period, Confucian culture has penetrated into the blood of Chinese children. Because of the cultural connection, it can be unified in the end. So after decades of war, China's dynasties have basically been reunified.

The cultural history of China lasted for 5,000 years, during which many dynasties changed. Many people find it strange. It seems that after a dynasty was overthrown, it was basically unified by one regime after decades of war, but it seems that other ancient civilizations, such as Rome, could not be unified.

In fact, this question is very simple. First of all, people, because of war, will inevitably bring serious disasters to the people. Many people are displaced, life is unsustainable, and they may survive in a short time. But after decades of war, both the people and the regime are actually very tired at this time. So many people are eager for reunification. This is because people will fall to the strong side, and the last side will win and unify China.

There is also a cultural reason, which is also very important, because since the Han Dynasty, Confucian culture has actually slowly penetrated into people's blood, so although people are in every corner, the big cultural background is the same, which also determines that the wars in China in the past dynasties are actually internal wars. Since it is an internal war, cultural differences are not great, and it is easier to unify.

So we can see that although China experienced many dynasties, no matter who became the head of the family, he was still China.