Let's analyze their respective hazards one by one:
Five random flowers, five lakes are five ethnic minorities: Xiongnu, Xianbei, Jie, Qiang and Di. The invasion mainly caused long-term war in the north, but at that time, Wuhu's civilization was very low, and most of it was assimilated by the Han nationality, so it had little impact on Chinese civilization.
After the invasion of the Mongolian Yuan Dynasty, some people said that the Yuan Dynasty destroyed the Southern Song Dynasty, and there was no China after the Cliff Mountain. After that, there was a great turning point in Chinese Wen Mingzhen. Moreover, Mengyuan adopted a high-handed policy towards the Han people, and Han people rarely participated in politics and entered the management. The killing of the Han nationality was also cruel, but the rule of the Mongols was short, the opposition between the Mongols and the Han nationality was sharp, and the Mongols failed to really conquer the Han nationality, so this time it was not the most serious. Of course, there are also advantages, that is, Tibet has been incorporated into Chinese territory for the first time.
Manchu entered the customs: if Japan's invasion of China is not counted, it will do the greatest harm to Chinese civilization this time. After the Qing Dynasty entered the customs, it wantonly tampered with and destroyed cultural classics, and then made a Sikuquanshu, which contained almost all the ancient books in China, and the previous historical materials and books were modified or destroyed by them, that is to say, many ancient books we see now were modified or deleted at that time. Moreover, the Manchu dynasty ruled for a long time and did the greatest harm.
Japanese invasion of China: This is the humiliation and pain in the memory of all China people since modern times, and its harm is self-evident.