Liu Bei proclaimed himself emperor in 22 1 A.D., when he had many followers on the grounds of helping the Han Dynasty. Naturally, Liu Bei's rise was very rapid, and Sun Quan began to proclaim himself emperor in 229 AD. After seeing Liu Bei and the sunrise, Emperor Xian of Han Dynasty laughed. On the contrary, Cao Cao has never sat in the position of emperor in his life, and it seems that he is not so eager to be proclaimed emperor.
In fact, Cao Cao was half a loyal minister, and he was "polite" to Emperor Xian of Han Dynasty all his life. When he was alive, he did not covet the name of the emperor in the world, but it was true that he "supported the emperor and made the princes." On the contrary, Liu Bei and Sun Quan stood at the highest point of morality and crusaded against Cao Cao, euphemistically calling it "getting rid of Han thieves". Really embarked on the road of claiming the emperor, so that the name of the rebellious minister was implemented on the shoulders of the two. On the other hand, Cao Cao is more like a traitor, hiding behind the emperor and commanding the people.
In fact, all three people are just for their own interests. Cao Cao has no world-recognized title, and rebellion is the last "face" to truly claim the title of emperor. Some people say that Emperor Xian had abdicated at that time, and they claimed that the emperor was not unfaithful. However, it is true that Emperor Xian of Han Dynasty is still alive, and it is not without royal blood. The fact that Emperor Xian is still alive is a deterrent to them. Since ancient times, if you want to be an emperor, you need to be justified.