What is the background of the migration of Wang Family Courtyard under Sophora japonica in Hongdong, Shanxi Province to Gansu?

Mainly because of the war, the population outside Shanxi dropped sharply. In order to maintain the population, the rulers of the Ming Dynasty began to emigrate from Shanxi to other provinces, once *** 18 times. It is said that people's little finger nails are two halves, all of which were immigrated from Sophora japonica in Hong Tong, Shaanxi. The specific distribution is rarely recorded in detail, as long as we know that their fingernails are in half, that is, the people there.