When did the Ming Dynasty immigrate from Sophora japonica in Hongtong?

After the war at the end of Yuan Dynasty, after more than 20 years, Zhu Yuanzhang unified the world. However, at this time, the mountains and rivers were devastated and devastated. Shandong, Henan and Hebei are mostly uninhabited areas. In order to restore agricultural production, develop the economy, balance the population, make the world peaceful and consolidate the rule of the Ming Dynasty, Zhu Yuanzhang adopted an immigration policy during the Hongwu period of the Ming Dynasty, and moved in according to the proportion of "four families stay one, six families stay two, and eight families stay three".