What are the large-scale population movements that have occurred in Shanxi in history?

Shanxi is located in Fenhe Plain, with fertile land, pleasant climate, developed agriculture and dense population. When Henan, Hebei, Shandong and other places suffered from famine and epidemic, Shanxi basically did not suffer from war, nor did it suffer from excessive floods, droughts, locusts and epidemics. On the contrary, the weather is good and the harvest is good every year. Compared with neighboring provinces, it can be described as social stability, economic prosperity and affluent population. Coupled with the influx of refugees from other provinces, Shanxi is more densely populated. In the fourteenth year of Hongwu, the population of Henan was 6.5438+0.89 million, that of Hebei was 6.5438+0.89 million, and that of Shanxi was 4.03 million, exceeding the sum of Henan and Hebei. & ltbr & gt According to the principle of immigration at that time, "people in ancient narrow villages listen to the words of wide villages, and there is no unemployment in important places", that is, people in places with a large population and a small number of people are moved to places with a large population and a small number of land, so as to reclaim land and develop production. There is no doubt that Shanxi has become a key area for immigrants. About 3 million people migrated from Shanxi to Beijing, Hebei, Shandong, Henan, Anhui, Jiangsu, Hubei, Shaanxi, Gansu and Ningxia. It is natural that the vast majority of immigrants accepted by Laoting come from Shanxi.