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".

The Ming government went through the formalities from Pingyang, Luzhou, Zezhou and Fenzhou in Shanxi, passed through the big pagoda tree in Hongdong County, Shanxi Province, and then immigrated to vast areas of the country.

Influence of Shanxi Sophora japonica migration;

Immigrants live in a mixed environment with indigenous people from all over the world. There are both communication and integration, as well as contradictions and competition. In these contradictions and competitions, they overcame national inertia and stimulated their intelligence, vitality and vigor.

In the process of integration, the survival ability of human beings has been optimized and improved, and various potential qualities of human beings have been activated, which has played a positive role in the history of human evolution in the Central Plains.

Great immigration promoted the reorganization of folk customs. People are the "comprehensive carrier" of folk customs. When a person or several people enter a new folk circle, they are often assimilated by local folk customs, which is called "when in Rome, do as the Romans do".

The folk customs of immigrants and local aborigines are reorganized in the process of integration, forming new folk customs. The folk customs in Laizhou are obviously different from those in the surrounding areas, because Laizhou was the center of Sichuan immigrants in the Ming Dynasty.

Another example is that Jimo is a relatively concentrated area of Yunnan immigrant villages, and the folk customs around Jimo bear the brand of Yunnan immigrants. The "Bangzi Opera" popular in Liaocheng and Heze, Shandong Province, also known as "Zezhou Tune", was brought to Shandong by Hongdong immigrants.

Refer to the above? Baidu Encyclopedia-Hong Tong Sophora Immigrants