This is the main theme.

In terms of patriotism, the Han and Tang dynasties were full of patriotic enthusiasm, but the patriotic enthusiasm in the Song and Ming dynasties was far behind. In the Han Dynasty, if you said you were a Han hater and hated the Xiongnu, everyone would think you were mentally ill. The Tang Dynasty was similar. Of course, the ethnic policy of the Tang Dynasty was very open, and many ethnic minorities did business and served as officials in China. But the main theme was patriotism, which you can see from Tang poetry. "If only the flying general was in Dragon City, the Hu horse would not be allowed to cross Yinshan Mountain."

In the Song Dynasty, people looked down on the Jin and Yuan dynasties culturally, but many people were already capitulators at heart, with Qin Hui as a representative. In modern times, under the blows of the Sino-Japanese War and the Boxer Protocol, the Chinese people's inferiority complex reached an extreme.

With the founding of New China and the reform and opening up, self-confidence and patriotism rose again.

In fact, the older you are, the more likely you are to be a traitor. I think the traitors born after 2000 will have less and less room to survive.