In Gu's view, national subjugation is just a change of surname, the emperor changed his surname, the people are still the original people, and the world is still the original world. But when dynasties change and society goes backwards, then this is not the end of the country, but the end of the world.
Wang Fuzhi, one of the three Confucianists in the late Ming and early Qing Dynasties, also held the same view. He believes that regime change can be Zen, sustainable and revolutionary, and should not be carried out among foreigners. In other words, regime change can abdicate, inherit and even rebel to seize power, but only "barbarians" can't occupy magpie nests, which is aggression and ruin the world.
Therefore, the Dashun Army who died in Li Zicheng in the Ming Dynasty was naturally a national subjugation, and it was a national subjugation that rebelled and seized power; Manchu is a barbarian. They invaded and destroyed the world.
Because Li Zicheng is a Han Chinese, his army is a Han Chinese regime, and the Manchu regime is an alien regime. Moreover, after the Manchu entered the Central Plains, forcing Han people to follow Hu customs was a national humiliation and a retrogression of culture, so it was called "the downfall of the world".
Of course, this is just the theory of two Confucian masters. As for whether this theory is correct, different people have different opinions, but it is clear that this is the epitome of an era. It took only a short time for people to accept Dashun dynasty, but it took a long time to accept Manchu rule.
Of course, as to whether this conclusion is accurate, different people have different opinions. However, one thing is certain, that is, Gu and Wang Fuzhi are the most influential thinkers in the late Ming and early Qing Dynasties, and their views are the epitome of that era. In that particular historical background, people generally accepted Li Zicheng's Dashun regime quickly, but it took a long process to accept the Manchu regime.