Four Great Immigrants in Chengdu's History

Strictly speaking, it is not immigrants from Chengdu, but immigrants from Sichuan and Sichuan. I only know these two times:

The first migration: After Qin destroyed Shu in the Warring States Period, some people moved to Sichuan and Shu. After the demise of the Qin Dynasty, Liu Bang was forcibly enfeoffed to Han by overlord Xiang Yu (that is, the junction of Sichuan, Xia and Gansu today), and the accompanying soldiers and civilians were the first to immigrate to Chengdu.

The last immigration was: Yungang Shengshi Lake was widely filled in Sichuan in the Qing Dynasty.