When was the migration of Shanxi Sophora japonica?

The migration of Sophora japonica in Shanxi is from 1370 to 14 17.

1. The migration of Sophora japonica in Shanxi refers to a historical event in which people from Pingyang, Luzhou, Zezhou, Fenzhou and other places in Shanxi migrated to all parts of the country in the early Ming Dynasty after going through the formalities of Sophora japonica in Hongtong County, Shanxi Province and receiving the "Sichuan endowment". This incident happened from the third year of Hongwu in Ming Dynasty to the fifteenth year of Yongle (1370 to 14 17), involving 1230 surnames. This is the largest population migration in the history of China, which lasted for 50 years and involved China 18 provinces and cities. The historical background of Shanxi Sophora Immigrants is social unrest and population loss caused by regime change. Population growth and land shortage caused by political clarity, social stability and economic prosperity in the early Ming Dynasty. The immigration policy implemented by the Ming government to develop the frontier, resettle refugees and prevent rebellion.