Why are there so many Hakka people in Sichuan? What are their reasons for coming to Sichuan?

Due to the long-term war and the spread of plague in Sichuan, Sichuan's population decreased by more than 80%. In the 1770s, Sichuan's indigenous population was less than 20%. Vast tracts of countryside were deserted. In order to restore production and develop the economy, the Qing government launched a movement of immigrants to reclaim wasteland. From 1680 to around 1800 AD, nearly a million Hakkas in Guangdong, Fujian, Jiangxi and other provinces followed the wave of immigrants that "Huguang filled Sichuan" and went through untold hardships and traveled long distances to participate in the reclamation and restoration movement westward into the interior. . Two hundred years after the Hakkas entered Sichuan, the Hakka spirit, customs, and dialects have been passed down from generation to generation among some people, allowing their connotations and representations to retain and inherit the distinctive Hakka style. These people are truly Sichuan Hakkas. There are also some people who know that their ancestors are from Guangdong (or call themselves Cantonese), but the Hakka dialect and habits have been stripped away. These people should be called descendants of Sichuan Hakka.