Why did Hongwu migrate in two years?

Reasons for the Great Migration of Hongwu in Two Years;

The Yuan government carried out ethnic oppression in China for many years, and the floods and famines in the Huanghuai valley continued, which finally aroused the Red Scarf Army uprising for more than ten years.

The Yuan government brutally suppressed, and desperate wars for territory and land occurred from time to time. Nine times out of ten people in Huaibei, Shandong, Hebei and Henan were killed. The wounds of the war at the end of the Yuan Dynasty were not healed, and the "Battle of Jingnan" followed in the early Ming Dynasty. Hebei, Shandong, Henan, Anhui and other places have suffered greatly, and almost all of them are uninhabited.

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"Hongwu two years" is not only a major difficulty in the origin of Sichuan immigrants, but also a puzzling topic in the history of immigrants in the Ming Dynasty. Looking around the migration activities in all parts of the country in the early Ming Dynasty, except the migration events in the exact year, they are usually expressed in the form of "two years of Hongwu".

Generally speaking, the phenomenon of "two years of Hongwu" in Sichuan should be understood as a kind of behavior of "Shu people and Chu people" caused by "taboo" after the Ming army pacified Shu.

Various local documents in Sichuan also prove that before the Ming army besieged Shu, all kinds of Chu people had moved to Sichuan, including those who took refuge in Chu at the end of Yuan Dynasty and those who followed Ming into Sichuan. Together, they formed the main body of "Chu people in Shu".