Why can't Liu Bei sweep the world?

Heroes in the chaotic world, the stars of the Three Kingdoms era, originally not Liu Bei's one-man show, self-made, the main opponents in the early stage, Zhang Xiu, Yuan Shao, Lü Bu, Liu Biao, Sun Quan, Liu Bei, Ma Chao, Zhang Lu, etc. are all princes of one side, and the strength is not bad.

The background of the last years of the Eastern Han Dynasty is that unlike the rebel armies of ordinary dynasties, they all serve the imperial court everywhere they go, do not work hard, and surrender after a while, or surrender directly.

The Three Kingdoms era was divided by princes and made their own decisions, so the struggle for the chassis was a desperate effort, it was not easy to unify the north, counting the kings in history, there were several wars experienced more than Liu Bei.

During the chaotic period of the late Han Dynasty, the south began to have a political power that divided one side and carried out full development. Economic production was not achieved overnight, nor does it mean that the south was not developed in the late Han Dynasty and developed after the Three Kingdoms.

Liu Bei was at that point, and even if he could be unified, it would inevitably split later, because the productive forces at that time could not support a unified dynasty across the two banks of the Yangtze River. Of course, the south was not fully developed at the beginning, otherwise Sun Quan would not have waited for eight years to officially become emperor, and at the beginning the south could not completely resist the north alone, and it would have to wait until Zhuge Liang's northern expedition involved Cao Wei before it could formally form a confrontation between the north and the south.

Liu Bei's unification of the world should be viewed from two angles, one is military and the other is political. Moreover, aristocratic politics had been formed at that time, and in this political model, a long-term rebellion was inevitable, because power was shared by many nobles.

This can also explain the decline of imperial power for more than four hundred years, and the emperors were replaced like marquees. For this situation, whoever comes is the same, there is no way to solve it. The soil of aristocratic politics is also the stage of the socio-economic foundation and the development of productive forces in a specific environment.