It should be said that this view has considerable historical limitations; furthermore, it should be reasonable within a certain historical period. For example, in the Wei and Jin Dynasties, the Five Dynasties period, and the Yuan and Ming Dynasties, this view is more applicable, while in the Qin and Han Dynasties, Tang and Song Dynasties, Qing Dynasty, and the Bashu Land during the War of Resistance Against Japanese Aggression all provided a steady stream of power for the rear areas and logistics bases of the Central Plains Dynasty. Of course, this is very much in line with the historical judgment of "three prosperity and two declines" in Sichuan's history: when Sichuan was strong in history, the land of Bashu would become a safe haven for the Central Plains Dynasty, and the Qin and Han dynasties relied on Bashu to unify the world, Tang Xuanzong took refuge in Shu during the Anshi Chaos, and Sichuan sent troops to support the War of Resistance during the War of Resistance; during the period of great historical turmoil, the land of Bashu, which was easy to defend and difficult to attack, was very easy to become a fertile land for careerists to establish a divided regime. In this case, "the world is not chaotic before Shu is chaotic, and the world has been ruled before Shu is ruled" may become a reality.
I don't know why when I see the title, I always think of the opening of "The Legend of ShuShan", and the voiceover at the beginning is this sentence in this sentence" "The world is not chaotic before Shu is chaotic". In fact, not only is any province in Bashu immutable, not to mention that "the pit ash is not cold and the Shandong is chaotic" Shandong is the eight hundred miles of rich Qinchuan and gradually became desolate after the Song Dynasty. The land of Bashu has been constantly changing for thousands of years from the founding of the silkworm bush in myths and legends to the anti-war period, and the rich and easy to defend and difficult to attack bashu land has also changed with the changes in the historical period. At the time of the great turmoil, there were constantly princes who divided Bashu and became the source of turmoil, which was also the source of "the world was not chaotic before Shu was chaotic"; and when the dynasty was stable, Bashu was the rear and stabilizer of the Central Plains Dynasty, and it would be more difficult if there was no Sichuan during the War of Resistance. During the period of great chaos in history, the country of Tianfu, which had abundant products and a large population, was very easy to become a divided regime; therefore, there is a saying that "the world is not chaotic before Shu is chaotic, and the world has been ruled before Shu is ruled"
Sichuan is a hot land, and the Sichuan Basin, where there is a country of heaven, has a fertile land and a large population, which has always been a rare place to start. Moreover, the mountains around Sichuan are easy to defend and difficult to attack, and the people's customs are fierce, and it is easy for both finance and taxation and soldiers to become a blessed place to divide. Therefore, in the period of great turmoil under the present day, Bashu could easily erect a banner to close the passes such as Hanzhong and the Three Gorges to become a local government that divided one side. Therefore, there is a title of "the world is not chaotic before Shu", such as The Yizhou Mu Liu Yan at the end of the Han Dynasty easily divided Bashu. After the gradual unification of the Central Plains Dynasty, because Bashu was easy to defend and difficult to attack, it often became the last unified divided regime, so there was a saying that "the world has ruled Shu but has not ruled". For example, after Zhu Yuanzhang established the Ming Dynasty to pacify the world, the Ming Xia regime established by Ming Yuzhen, who was entrenched in Sichuan, became the last separatist regime to be eliminated. Because Bashu is easy to defend and difficult to attack, it is usually necessary to capture Bashu with the overall situation to slowly offset the advantages of the divided regime.
Liu Bei in the Three Kingdoms period also used Zhang Song's dedication map and Fa Zheng to do internal responses, and only then did the dove occupy the magpie's nest to establish the Shu Han. After pacifying Zhang Lu and winning the battle of Hanzhong, he easily closed the Hanzhong Pass and established the Shu Han regime. After the Rebellion of the Eight Kings of the Western Jin Dynasty, before the Xiongnu Liu Yuan could establish the Han state with hundreds of officials in Hezhou, Li Xiong had already established the Chenghan division regime in Bashu. Relying on the natural advantages of Bashu being easy to defend and difficult to attack, Chenghan persisted for nearly half a century, and if it were not for the corruption and cruelty of the last emperor of Chenghan, he might have been able to persist for a longer time. At the end of the Ming Dynasty, Zhang Xianzhong, the king of Daxi, also established the Daxi regime in Bashu, competing with Li Zicheng's Dashun and Nanming.
In the prosperous Qin, Han, Tang and Song dynasties in history, the land of Bashu was a strong backing and source of taxation for the Central Plains Dynasty; there was no possibility that the world would be chaotic before Shu. In fact, in the three prosperous periods of Sichuan's history, namely the Qin and Han Dynasties, the Tang and Song Dynasties, and the Bashu Land during the Qing Dynasty, it was definitely the strong backing of the Central Plains Dynasty. After the annexation of Bashu, the State of Qin obtained stable sources of wealth and grain, which supported the hegemony of the Qin State of annexing the two weeks and the fallen princes to unify the world; and Liu Bang, the ancestor of Han Gaozu, also used Bashu and Hanzhong as a base, secretly crossed Chen Cang into Guanzhong and then ignored the crowd, thus pacifying the world and establishing the foundation of the Han Dynasty for four hundred years. The Anshi Rebellion was when Emperor Xuanzong of Tang took refuge in Bashu, and in addition to Yang Guozhong's selfish intentions, Sichuan (Jiannan Province) was indeed an important town for the defense of Tubo during the Tang Dynasty. Not only was the army well fed and loyal to the Central Plains Dynasty, so it became a safe haven for Tang Xuanzong. Therefore, whether Bashu is the source of turmoil or the root of reunification in history depends on the general trend of the world.