Take the historical period of the Romance of the Three Kingdoms as an example: As far as the Three Kingdoms period is concerned, the three kingdoms split at the end of the Eastern Han Dynasty, and the Wei, Shu and Wu Sanda families divided and ruled China for about 400 years. This is "long-term separation" in the article. But 400 years later, the Wei, Shu and Wu Sanda families also returned to the State of Jin and were unified by the State of Jin. Isn't it that they will unite after a long time?
Not only during the Three Kingdoms period, the historical development of our country has always been such a law. During the Song, Liao and Jin Wars, the Five Dynasties and Ten Countries split, and later the Yuan Dynasty unified the whole country. The change of Ming and Qing dynasties at the end of Yuan Dynasty is not only the development and extinction, but also the unification of new China. Therefore, we can roughly sum up the laws of historical development.
In fact, this sentence can be understood as: if a country wants to develop and be stable, the most important thing is the people's hearts, and those who win the people's hearts will win the world. Therefore, during the war, the people will definitely lead an unstable life, and everyone is looking forward to living and working in peace and contentment. Therefore, if the country is not unified, there will be peasant uprisings and eventually it will naturally move towards reunification.