All kinds of excellent generals and counselors basically account for a large part of Liu Bei, which is also the capital for Liu Bei to establish Shu State. Under the pressure of Wu Shu, Liu Bei gained a firm foothold, which became a trend of "three points of the world", but the subsequent national subjugation was a bit unreasonable. There are several reasons for the disillusionment of the dream of reviving the Han Dynasty.
First of all, Liu Bei's emotional battle of Yiling greatly damaged his comprehensive national strength.
Guan Yunchang's death has made Liu Bei lose his mind. Persuaded by many people, Liu Bei made a desperate choice to conquer Wu with the strength of the whole country, and finally suffered a crushing defeat, which made the newly established flame of Shu seem to be broken. It is more difficult to realize the dream of unifying the world and reviving the Han Dynasty in this Shu country, which is also a foreshadowing of the country's national subjugation in the middle and late period.
Second, there is chaos in the central Sichuan, and there is a shortage of outstanding talents.
After Liu Beiren's death, Zhuge Liang was left to fight alone. Zhuge Liang had high hopes and undertook all this to help the latter rectify Shu. The size of the army is decided by the Prime Minister. After Zhuge Liang's Northern Expedition, no one in the DPRK took on the heavy responsibility, indicating that internal affairs had gone wrong. For example, eunuch Huang Hao is the most typical. This made Zhuge Liang at the front line unable to fight with peace of mind.
On the other hand, Ma Su's arbitrariness led to the failure of the first Northern Expedition, and the morale of the troops was frustrated. It is hard not to have a top general like Huang Zhao, which is also one of the key factors for the slow decline of Shu.