Simply put, subjective reasons are human factors, and objective reasons are external reasons. For example, the subjective reason for China's defeat in the Sino-Japanese War was that the Qing government was not enthusiastic about fighting, Cixi took the "peace" route, and the Beiyang Navy was negligent in training; The objective reason is that Japan is stronger than China, and the feudal system can't compete with the capitalist system and so on ~ ~ ~ ~

Anyway, they are all historians of later generations. According to the later situation, Monday morning quarterback, everyone can have his own opinion. History is boring when it dies.