First, Xiang Yu does not have the strategic ability to unify the world. Through the banquet at Hongmen, Xiang Yu apparently surrendered to Liu Bang, who was the second most powerful vassal in Guanzhong, ranking second only to Xiang Yu. At this point, Xiang Yu successfully subdued all the governors in Guanzhong and gained the power to dominate the world in Guanzhong.
However, when Xiang Yu dominated the world, he did not show the strategic ability to dominate the world at all. Guanzhong, which has the most strategic position, was enfeoffed by Xiang Yu to three Qin generals in order to prevent Liu Bangbing from leaving Bashu. And myself, occupied the largest piece of the original Chu State, and the rest was given to the former, the former Chu State * * * Ao, the former Chu State general Ying Bu, and the former broken Rui. Xiang Yu positioned his title as the Western Chu State. Around the Western Chu State, there were vassal states such as Qi, Zhao Xie, who refused to obey Xiang Yu, and fragile vassal states such as Western Wei and Korea.
Later, Liu Bangbing went out of Bashu and settled on Sanqin. Then it quickly annexed the fragile governors such as Yin, Henan, Western Wei and South Korea, which were enfeoffed by Xiang Yu. Xiang Yu's West Chu lost its strategic buffer and directly faced Liu Bang's powerful offensive. At the same time, Shi Tian, Chen Yu, Peng Yue and other governors who refused to accept Xiang Yu continued to be enemies of Xiang Yu. Then, Ying Bu and Wu Rui joined the camp of Liu Bang and Xiang Yu.
The so-called fist is not comparable to many hands. Xiang Yu originally sealed the nine counties of Chu to himself just to make it easier for him to beat others, but Xiang Yu forgot that he chose the land where there was no danger in the fourth world war on the border to defend, which really facilitated him to beat others and others to beat himself. This is why he learned a painful lesson from the fall of Pengcheng, the capital, at the beginning of the Chu-Han struggle.
After the short fall of Pengcheng, Xiang Yu still did not show any strategic ability to dominate the world, while Liu Bang changed his strategy. Anyone who has the ability to help him claim the title of emperor has a chance to get a fief. Therefore, Han Xin, Peng Yue and Ying Bu stand out. The dispute between Chu and Han ended, and they occupied Qi, Jiujiang, Liang, Zang-no and Return respectively.
At the end of the Chu-Han struggle, Xiang Yu made an alliance with Shi Tian after Han Xin seized the land of Qi. At this time, Shi Tian is just an empty shelf. When Long Zhi died in Weishui for Shi Tian of Qi, he thought of wooing Han Xin. At this time, Han Xin has been named King of Qi by Liu Bang, and Xiang Yu can't promise anything to Han Xin.
This is Xiang Yu, who did not show the foresight to unify the whole country when he slaughtered the whole country. After the Battle of Pengcheng, he still did not show any strategic ability to dominate the world. At the end of the battle between Chu and Han, he finally wanted to rely on other princes temporarily, but he chose the wrong object or could not do any substantial benefits. At this time, Xiang Yu was basically the fat on the chopping block. What he wanted later was to kill Xiang Yu and divide Xiang Yu's land.
Second, Xiang Yu has no strategic vision to unify the whole country. Before Xiang Yu ruled the country, a lobbyist lobbied Xiang Yu. Chen, a lobbyist, talked about the terrain and wealth of Guanzhong, and finally came to the conclusion that with Guanzhong's capital, he could dominate the world.
The lobbyist said nothing more than a weakened version of Qin's unification of the whole country. Before Qin unified the whole country with Guanzhong, Qin also developed into a tyrant with Guanzhong.
After being reminded by lobbyists, Xiang Yu seemed to have a reaction, but Xiang Yu looked at the dilapidated Qin Gong and missed his hometown. He said an eternal famous saying, "Riches don't return to his hometown, like clothes and brocade, but who knows?"
This sentence fully exposed Xiang Yu's short-sightedness and returning home with wealth, which is just the idea that ordinary people will have, and the son of heaven is at home everywhere, and life is everywhere in his hometown.
In addition, the purpose of making Guanzhong its capital is to seek hegemony and even unify the whole country, not to enjoy it, even if Qin Gong burns down. The place where the emperor lived, even if humble, had the spirit of Wang Ba, and those who had no talent in Wang Ba, such as Zi Ying, lived in Qin Gong, which could not change the general trend of the world.
Besides, who burned Qin Gong? Xiang Yu himself.
After the Hongmen banquet, Xiang Yu successfully entered Xianyang and Qin Dou. In Xianyang, Xiang Yu showed the style of bandits, burning and looting, and even digging the tomb of Qin Shihuang for money.
On the other hand, Liu Bang did not kill Zi Ying, the king of Qin, when he arrived in Xianyang. At the same time, it also retained the original local officials of Qin State and made three chapters with Guanzhong people. Don't kill Zi Ying, let the original local officials of Qin believe that Liu Bang won't engage in liquidation, and be willing to help Liu Bang and stay in the original local officials of Qin State, so that Liu Bang's decrees can quickly reach the level of the people with the help of the original bureaucratic system of Qin State, and make three chapters with the Guanzhong people, which can win the hearts of the Guanzhong people to the maximum extent and lay a public opinion foundation for the future Guanzhong king.
Later, Xiang Yu once occupied all the land and burned and looted it. How can such a vassal, who occupied and robbed a place, have the vision of dominating the whole country? Even if there is no vision of a common world, how can we talk about a unified world?
Thirdly, there is no capable minister around Xiang Yu who can help Xiang Yu unify the whole country. In fact, although Liu Bang has the strategic ability and vision to dominate the world, he sometimes makes mistakes. When he made a mistake, he often reminded Liu Bang to unify the world with the same vision and mind.
Liu Bangchu entered Xianyang and enjoyed it. Seeing that Qin Gong is full of beautiful women and jewels, he wants to live in Qin Gong for a long time. Although it is far from Xiang Yu's burning and looting, it is also a big mistake. At this moment, Fan Kuai stood up, and so did Sean. After persuasion by Fan Kuai, Sean and others, Liu Bang resolutely realized his mistake and quickly made a pact with the Guanzhong people to reduce their fears.
What was Fan Zeng doing when Xiang Yu was burning and looting in Xianyang? I didn't do anything, and I didn't dissuade him at all. Others, such as Xiang Bo, did not come forward to dissuade them. The same thing happened in the later land of Sanqi. If Xiang Yu is not in Qi State, it is impossible for Tian Heng to rise again in Qi State, and Xiang Yu can occupy Qi State. If Xiang Yu occupied Qi and Chu, even if Liu Bang briefly occupied Cheng Peng, even if Liu Bang had such talents as Han Xin, Sean and Xiao He, Xiang Yu could share the world with Liu Bang, if not.
When Liu Bang entered Xianyang, Liu Bang's prime minister, Xiao He, went directly to the state treasury and searched books and decrees hidden by Qin Xiang and Qin Shiyu. After Liu contended for the world, where the strategic fortress was, where the people were rich, why the people suffered, and the system in the early Han Dynasty was perfect, all of which depended on Xiao He's information.
And after Xiang Yu entered Xianyang, Xiang Yu himself didn't want to find this batch of information taken away by Xiao He, and Xiang Yu's courtiers didn't care about this batch of information taken away by Xiao He. Everyone followed Xiang Yu to burn, kill and plunder, so how can he plan for the future struggle for the world?
Whenever Xiang Yu's capable ministers like Xiao He and Sean are reused, Xiang Yu will share the world with Liu Bang, if not unify the whole country.
To sum up, Xiang Yu failed to unify the whole country, not because he didn't kill Liu Bang at the Hongmen banquet, but because he didn't have the strategic ability and vision to unify the whole country, and there were no ministers around him who could help him unify the whole country. If he killed Liu Bang at the Hongmen banquet, Xiao He, Sean, Fan Kuai and other talents who had a unified national vision could also help another person to unify the country, such as Liu Jiao, Liu Bang's fourth brother, who had a high prestige in the army at that time and had a relationship with Liu Bang. He is likely to become the new "Pei Gong" after Liu Bang was killed, and then compete with Xiang Yu.