At the end of the Eastern Han Dynasty, Dong Zhuo brought disaster to Beijing. At that time, there was no majesty in the Han Dynasty, so many governors began to divide themselves and fight with each other. As a result, three countries appeared in Wei Shuwu. Among them, Wei is a relatively large country where Cao Cao occupies all the land north of the Yangtze River and south of the Great Wall, while Soochow owns many lands such as Yangzhou, Jingzhou and Jiaozhou. However, Shu is relatively weak. At that time, there were only Yizhou and Hanzhong areas in Shu.

Although Shu was the weakest country, Zhuge Liang, then prime minister, advocated continuous northern expedition. Therefore, the national strength of Shu became weaker and weaker, and finally Si Mazhao destroyed Shu. Then at this time, someone will ask, if Zhuge Liang chooses to recuperate, what will happen to the fate of Shu? In fact, this is about the establishment of Shu Han. At that time, Cao Pi established the state of Wei on the spot, so Liu Bei established Shu Han in the name of inheriting the Han Dynasty.

So after Liu Bei proclaimed himself emperor, many generals loyal to the Han Dynasty came to take refuge in him. However, after the establishment of Shu at that time, the country's territory was very small, and there were still many foreign rebellions. If Zhuge Liang does not choose the Northern Expedition, he will always suppress the aliens. Zhuge Liang understands that only by changing the status quo can there be a way out. So Zhuge Liang began the Northern Expedition to prolong the life of Shu Han. Although it will consume a lot of national strength, it will prolong the life of Shu Han to a certain extent.

But without the Northern Expedition, Shu Han would only be a local separatist force. At that time, people will see this situation and start looking for Wu Dong and Cao Wei. So Zhuge Liang thought that he could give some hope to the people and officials of the country through the Northern Expedition. But in the end, the national strength of Shu became weaker and weaker, and the final demise of Shu was inevitable.