Why did people from Shanghai and Guangzhou move to Sichuan in the Qing Dynasty? What happened in Sichuan?

"Huguang filling Sichuan" refers to the decades from the late Ming Dynasty to the early Qing Dynasty, when Sichuan was "filled" because of the war, and the population was extremely scarce and needed to be enriched. Sichuan suffered the most from the 30 years of war in the late Ming and early Qing dynasties. 1644, Zhang led a peasant uprising and entered Sichuan. /kloc-proclaimed himself emperor and established political power in 0/2, with the title of "Daxi" and Chengdu as "Xijing". Sichuan became the land of four wars: the Ming army killed indiscriminately, the Qing army killed indiscriminately, the local strongmen killed indiscriminately, the rural hooligans killed indiscriminately, and Zhang was also suspected of killing indiscriminately. Then the war between Nanming and Qing army; And Wu Sangui's war with the Qing army after anti-Qing. The people of Sichuan have suffered wars and massacres again and again. ), plagues and natural disasters followed, the population in the territory dropped sharply and the cultivated land was barren. Under this specific historical condition, in order to solve the problems of labor force and grain production in Sichuan, the Qing Dynasty adopted the measures of "reclaiming land for wasteland", and ten immigrants from Yu Sheng, such as Hubei and Hunan, settled in Sichuan one after another, with Hubei and Hunan being the most. According to statistics, this migration lasted for more than 100 years, and the number of people entering Sichuan was about one million, of which Hubei and Hunan provinces each accounted for half. Among the immigrants in Hubei Province, Macheng immigrants occupy an important position.