Before Cao Cao and Liu Bei died, they both said that 1 person needed to beware, and then it really happened
Introduction: The art of taming people has always been a compulsory course for ancient Chinese emperors, we all know that in ancient Chinese history, there are courtiers who have greater ability than emperors, but they are at ease to be loyal to the emperor, which can also reflect the wisdom of the emperor's skill of taming people from the side. And if you want to talk about the masters of the art of taming people in the Three Kingdoms period, you have to mention Liu Bei and Cao Cao. The thesis ruled the world, Liu Bei was not as good as Zhuge Liang, Fazheng, etc., on Wu'an Sifang, Cao Cao was not as good as Cao Ren, Zhang Liao, etc., but Cao Cao and Liu Bei could make these people feel at ease under his subordinates, which showed the cleverness of his means of taming people.

But Liu Bei and Cao Cao both encountered a very difficult problem in the process of taming people, that is, the arrangement of posthumous affairs and a long-term plan for the successor. As far as Liu Bei was concerned, he had a loyal Zhuge Liang to entrust, as long as he handed over all the important things to Zhuge Liang. Logically, he should be very relieved, but in fact, Liu Bei was not at ease about his own posthumous affairs, and when he was alone in the White Emperor's City, he bluntly pointed out to Zhuge Liang that there was a person who could not be reused, who? Ma Mo, who had been serving Zhuge Liang's side.
Liu Bei's concern was not that Ma Mo's ability was outstanding, and Zhuge Liang could not control it, but that Ma Mo's people had their own appearances, and on the surface they were a little exaggerated about the art of war, but in fact, they did not have the ability to do practical work, and could only hold some auxiliary positions, and could not bear great responsibilities. Although Zhuge Liang explicitly promised Liu Bei not to reuse the horse mo, in the later Northern Expedition, he still reused the ma mo and let him defend the street pavilion. As a result, One of zhuge Liang's most likely successful Northern Expeditions failed because of Ma Chen's stupidity. The failure of the Northern Expedition seriously damaged the morale of shu Han and had a profound impact on the later Northern Expedition of Shu Han, and Liu Bei's worries were fulfilled!
And Cao Cao's arrangement of posthumous affairs returns to a very classic problem, that is, the courtiers are really capable, and if the successors cannot control them well, it will be endlessly troublesome. Therefore, before Cao Cao died, he specifically explained that Cao Pi should retain Sima Yi's appointment and could not give Sima Yi too much power to prevent Sima Yi from having too much power and affecting Cao's regime.
Cao Pi strictly carried out Cao Cao's will, used and defended Sima Yi, and before his death, he also told Cao Rui to beware of Sima Yi. Although Cao Rui agreed to Cao Pi's dying words, in fact, Cao Rui pulled Sima Yi to the front line in the confrontation with the Cao clan, and Sima Yi seized the opportunity to vigorously cultivate his own power. When Cao Rui died and Cao Fang succeeded to the throne, Sima Yi felt that the time had come, so he launched the famous Gaopingling Mutiny and seized Cao Wei's power, and Cao Cao's worries were fulfilled!
Conclusion: I have to say that the reason why Cao Cao and Liu Bei can dominate one side is that they do have their own superiority, at least they are indeed stronger than ordinary people in terms of understanding people and the art of taming people. But unfortunately, their successors did not have the same knowledge and skill of mastering people, which led to the subversion of the regime they had worked so hard to build. Of course, there are also some netizens on the Internet who believe that Liu Bei and Cao Cao should kill Ma Mo and Sima Yi before they die, so as to avoid the consequences.