After reading history, Cao Cao naturally would not make such a mistake as in history, and was burned by an east wind to the point that there was no slag left.

But the outcome of everything in the world is not just accidental. The reason why Cao Cao was defeated in Chibi was actually due to three main reasons, one was that he was too careless, and the other was that the sailor was not strong enough.

And the last and most important reason is that Jiangnan is on the rise under Sun Ce's governance.

After absorbing a large number of refugees from the north, Sun Ce reclaimed most of the fertile land in the south of the Yangtze River, cleared the barbarians who often made trouble on the border, and used advanced sea ships to obtain many excellent crop seeds from Southeast Asia, Yizhou and other places.

If it weren't for Cao Cao's timely unification of the north, then Sun Ce would even have the strength to raise troops for the Northern Expedition and unify the whole country a few years later.

You must know that in the original history of the Three Kingdoms, the Western Jin Dynasty was able to destroy the Eastern Wu because Sun Hao, the monarch of the Eastern Wu Dynasty at that time, was too brutal and brain-dead: not only made the people of the Eastern Wu panic, but also abandoned the defense facilities built on both sides of the Yangtze River.

Therefore, when Cao Cao's strength was not much stronger than that of the later Western Jin Dynasty, it was extremely difficult to defeat Liu Bei, who had a secret recipe for gunpowder, and Sun Ce, who stabilized Jiangnan.

The two sides held out in Chibi for several months, Cao Cao was never able to find a chance to defeat the Sun-Liu coalition army, and finally because of the news of the rebellion of the Xiongnu Koubian and Xiliang from the north, he reluctantly burned the warship and the army withdrew.

Cao Cao was not defeated in Chibi this time, so he was not in a hurry when he withdrew, and did not give Liu Bei and Sun Ce a chance to pursue.

However, after Cao Cao's army left, Liu Bei still led his army to capture most of Jingzhou's land, and also imitated history, taking advantage of Liu Zhang's fear of Zhang Lu, and led the army to capture Yizhou.

Liu Bei embarked on the old road of dividing Western Shu, Sun Ce not only stabilized his rule in Jiangnan, but also sent a large number of trade fleets to the sea, relying on the sea charts copied from the side called Xunze, and successfully established contact with the Kushan Empire, the Persian Empire, the Roman Empire and other countries in ancient India at that time, and started trade.

And after his death, he did not pass the position of monarch to Sun Quan, but to his own son.

However, it is a pity that Sun Quan, as Sun Ce's younger brother, is second only to Sun Ce in authority in Eastern Wu.

Although he promised Sun Ce that he would assist his son when Sun Ce was seriously ill. But only two years later, Sun Quan succeeded in seizing power under the pretext that Sun Ce's son was not virtuous.

After Sun Quan took control of Soochow, history returned to its old ways. The Sun-Liu alliance was self-defeating, and even if Sun Ce married Sun Shangxiang to Liu Bei as early as the Battle of Chibi, it could not stop Sun Quan's coveting of Jingzhou.

So when Guan Yu tried to regain all the land in Jingzhou from Cao Cao's men, Eastern Wu attacked Guan Yu with his back, and Lü Meng still crossed the river in white clothes, trapped Guan Yu in Maicheng with Cao Cao, and finally died.

After Guan Yu's death, although Liu Bei knew that the crusade against Eastern Wu was likely to fail, he still raised troops to attack Wu to take revenge. Then because of Lu Xun's genius tactical play, the battle did not go well, and he retreated in embarrassment, entrusting Zhuge Liang to the White Emperor City.

According to historical records, Liu Bei asked Zhuge Liang to rest and recuperate after his death, and not to attack Wei. However, after Zhuge Liang managed Shu Han for several years, he still raised troops to the Northern Expedition to the Central Plains many times. But it was still in vain.

It is worth mentioning that Liu Bei did not claim the title of emperor this time, so later generations called him King Zhaolie of Han instead of Emperor Zhaolie of Han.

The reason why Liu Bei did not become emperor was naturally Cao Cao's series of efforts to change history.

Cao Cao's knowledge in modern times mainly includes scientific farming and constitutional monarchy.

Among them, scientific farming methods helped Cao Cao quickly restore the grain output that was affected by the war.

For the ancient people, food always came first. Whether it is to appease the people or to march to war, food is indispensable.

With enough food, Cao Cao swept away the remnants of Yuan Shao after the Battle of Guandu faster than in history. And he also unified the north a year ahead of schedule.

After the north was stabilized, the first thing Cao Cao did was to find a reason to destroy the Sima family, and to see Sima Yi executed.

Although the destruction of the Sima family made Cao Cao have another black spot, but there are more black spots on Cao Cao's body, and it doesn't hurt to have one more.

The destruction of the Sima family was to protect Cao Wei's future, and how to deal with Emperor Han Xian was related to Cao Wei's present.

As early as when Cao Cao was still studying library management under Xun Ze, he studied the constitutional monarchy system dozens of times.

So after he returned to the Han Dynasty, he established a constitutional monarchy with Cao Wei characteristics to ensure the legitimacy of his rule.

Historically, Cao Cao's constitutional monarchy has been highly evaluated, and Xun Ze can search casually to find articles about the impact of the constitutional monarchy founded by Cao Cao on history.

The reason why the constitutional monarchy system founded by Cao Cao is called a characteristic constitutional monarchy system is because this system was established entirely to ensure the legitimacy of the Cao family's governance in the Han Dynasty, not to limit imperial power.

First of all, Cao Cao deified Liu Bang as the son sent to the world by Haotian, the son of a god who descended to earth in order to end the tyrannical rule of Qin.

Therefore, the Liu family has Haotian's blood flowing in their bodies, and they are the sons of heaven who are different from mortals. However, because the human world is so filthy, the son of heaven will be infected with all kinds of evil deeds of mortals after staying in the human world for a long time, and become a tyrant.

Therefore, when Haotian saw that the sons of heaven left by Liu Bang gradually became brutal, he once again sent his other son Liu Xiu and his boy Wang Mang to save the Han Dynasty.

But since Liu Xiu is also the son of heaven, then his descendants will also be contaminated with the evil ****** of mortals.

So after Haotian found out about this situation, he sent another boy under his seat, that is, Cao Cao, to save the Han and at the same time be responsible for purifying the son of heaven.

After propaganda and letting everyone know about it, Cao Cao built a high palace in Xuchang and named it the Palace of Heaven.

The function of this palace is to purify those polluted sons of heaven, and Liu Xie, the emperor of Han Xian, was naturally sent here by Cao Cao, and he could only meet outsiders at a fixed time every day.

The Son of Heaven has been imprisoned and purified, so the government always needs someone to take care of it.

Therefore, Cao Cao, as a boy under Haotian, stipulated that the Cao family, as a descendant family of the boy under Haotian, had the qualifications to manage the country on behalf of the son of heaven.

The Son of Heaven needs to go through a hundred generations of reproduction before he can purify the human vices he has been contaminated, so the Cao family needs to replace the Son of Heaven to govern for a hundred generations, and has established relevant contracts and laws.

It was stipulated that the emperor, as the representative of the state, could only attend various occasions as a symbol of the state until the purification was completed, and had no actual rights.

And the Cao family, as the actual ruler of the country, will return to the Liu family after Liu Xie's reproduction for a hundred generations, if Liu Xie's family does not return to power after a hundred generations, then the world will attack it together.