It is not true that Shu Han and Wu Dong share the world equally. In fact, both of them have ulterior motives and distrust each other. When Cao Cao was powerful, Sun Liu formed an alliance with Sun Quan, who lent Jingzhou to Liu Bei. Although Cao Cao failed in Battle of Red Cliffs, he is still a strong man. Sun Quan needed Liu Bei, so he lent Liu Bei the land of Jingzhou, let Liu Bei develop, and then fought against Cao Cao together. Later, Liu Bei won the land of Yizhou, and Sun Quan sent Zhu Gejin back to Jingzhou. Liu Bei refused, saying that he is not developed enough now, so let me develop. At this time, the Sun-Liu Alliance began to disintegrate.

After the tension between the two sides, Cao Cao began to fight Hanzhong, and Liu Bei was a little panicked. Then make up with Sun Wu and return half of Jingzhou to Sun Quan. Sun Quan thought that Cao Cao was still the enemy at that time, so he thought about it. Later, Liu Bei took Hanzhong, vaguely as if he wanted to be the best guy. At this time, Sun Quan privately formed an alliance with Cao Cao. Later, Sun Quan recaptured Jingzhou and Guan Yu died. Liu Bei saw Sun Quan attacking Guan Yu and launched the Yiling War. Liu Bei was defeated in the battle of Yiling. Liu Bei also died later. Originally, the two families were incompatible with each other, but they re-allied.

Because Shu Han is now called the weakest, Cao Wei has become the strongest. If the two groups continue to fight, Cao Wei will only reap the greatest benefits. Anyway, two people with different intentions have formed an alliance. After Cao Pi proclaimed himself emperor, Sun Quan proclaimed himself emperor a few years later. At that time, Zhuge Liang was in charge of Shu Han. It is unreasonable for Sun Quan to proclaim himself emperor only as a vassal. At that time, Zhuge Liang sent someone to congratulate him and recognized the emperor. The main purpose of their alliance was to fight against Cao Wei, so after Cao Pi's death, they began to carve up Cao Wei.

Personally, this so-called grand plan is just a joke or just for both sides to appease some internal forces. Zhuge Liang northern expedition, Soochow also sent troops to fight Cao Wei. But Zhuge Liang's Northern Expedition had no effect except for the first time, and so did Soochow. Later, after Zhuge Liang's death, Wu Dong sent troops to the border between Wudong and Shu Han. To put it bluntly, I just want to take advantage of Zhuge Liang's death and see if there is any chance to get some places. We can see that the alliance between Wu Dong and Shu Han actually has its own small plan, which is unreliable and neither side can trust the other. This is just a slogan to divide the world.