In 219, after Guan Yu, who was made a former general, placed the rear of Jingzhou, he led most of the Shu Han army stationed in Jingzhou to besiege the two cities of Xiangfan, when Guan Yu attacked Fancheng, and the defender of Fancheng, Cao Ren, could not resist Guan Yu's attack, and he held the city while asking Cao Cao for help. Cao Cao was worried that Guan Yu would go directly into the hinterland of the Central Plains after attacking Fancheng, so he ordered Cao Ren to defend it, and at the same time sent a large army of The Seven Roads of yu to rescue Fancheng, in order to ensure that Fancheng was not lost, Cao Cao also let Xu Huang sit in Wancheng for emergency. However, Yu Ban mistakenly stationed his army in a low-lying place, so that the Seven Roads Army was flooded by the flash flood caused by the Han River, Guan Yu took advantage of the situation to kill, so he forced Yu to surrender and kill Pound, and for a time, Guan Yu's momentum shocked Huaxia. Cao Cao saw that Guan Yu was unstoppable and almost planned to move the capital, but under the persuasion of Sima Yi and others, Cao Cao did not move the capital, and he divided Jiangnan to Sun Quan, and on this condition, asked Sun Quan to attack Guan Yu's rear. After Sun Quan agreed to Cao Cao's request, he sent someone to defeat Guan Yu.
After Sun Quan captured Guan Yu and took Jingzhou, Cao Cao's cousin Sun Quan was made the general of The Hussars and the Pastor of Jingzhou. Sun Quan immediately sent envoys to pay tribute, declared himself a vassal to Cao Cao, and persuaded Cao Cao to replace the Han Dynasty and proclaim himself Emperor of Great Wei. At that time, Cao Cao sent Sun Quan's letters to the inner and outer courtiers, who took the opportunity to persuade Cao Cao to advance, but Cao Cao did not want to abolish the Han Xiandi emperor and establish himself, and said that he believed that he should be the King of Zhou Wen. The following year, Cao Cao returned to Luoyang, became seriously ill, and died in the city of Luoyang. It is not difficult to see that although Cao Cao was promoted to the throne of Wei in this life, he did not ascend the throne and become emperor, but became a Han courtier for a lifetime. It should be known that King Wen of Zhou was also loyal to the great merchant all his life, but his son King Wu of Zhou was a queen of Zhou who rebelled against the queen and established the Zhou Dynasty, so cao Cao did not claim the title of emperor, was it the result of consultation with Cao Pi?
In fact, Cao Cao's not being called emperor was not something he had discussed with Cao Pi, and the reason why Cao Cao did not claim the title of emperor was actually because Cao Cao happened to die. In 213 AD, Cao Cao was made the Duke of Wei and Jia Jiuxi, although before that, Cao Cao was worried that Xun Yu would oppose it, and specially sent someone to secretly tell Xun Yu about it, but after xun Yu's direct opposition, Cao Cao was very angry, he not only put Xun Yu under house arrest, but even sent an empty food box to show that Xun Yu was loyal to the king, forcing Xun Yu to take poison and commit suicide, with full name, which shows that on the road to power advancement, Cao Cao does not allow anyone to stop him, even Xun Yu.
Three years later, Cao Cao ascended to the throne as King of Wei and used the Heavenly Son's Honor Guard, and soon after, Cao Cao granted himself some privileges. It is reasonable to say that as long as this speed is followed, Cao Cao will certainly force Emperor Xian of Han to give way within a year or two, but unfortunately the sky is not the wish, and soon after this, Liu Bei marched into Hanzhong and confronted Xiahou Yuan, and later Xiahou Yuan came to compete with Liu Bei for Dingjun Mountain and was beheaded by Huang Zhong, and Cao Cao had to personally go to Hanzhong to supervise the battle. It's just that Hanzhong is like a chicken rib for Cao Cao, and in order not to affect the overall situation, Cao Cao can only retreat. In the same year, Guan Yu flooded the Seventh Army, threatening Huaxia, so that Cao Cao almost had plans to move the capital, although Guan Yu was later defeated by Sun Quan, but by this time Cao Cao's momentum had been affected to a certain extent.
In Cao Cao's later years, he had already used the Tianzi ceremonial guard, which was already like the existence of the Heavenly Son for him, and in terms of power, he was far superior to emperor Xian of Han in Xudu. It's just that Cao Cao, who has always been a military power, constantly faced with natural disasters and man-made disasters after becoming king, and his conquest of Hanzhong failed, and even the conquest of Eastern Wu was fruitless, which shows the great blow of these things to Cao Cao. Because of this, in his later years, no matter how much Cao Cao wanted to be emperor, he was too busy to take care of it. In the first month of 220 AD, Cao Cao died, so things like the establishment of the emperor's country were entrusted to Cao Pi.
The author believes that Cao Caozhi did not claim the title of emperor, mainly because he could not take care of himself after becoming king, so at that time, he did not call himself emperor, not in consultation with Cao Pi, but because he happened to die.