Where did the immigrants from Hongdong County in Shanxi go?

I have a little impression. That was in the Ming Dynasty. It has something to do with the story of the prince sweeping across the north. Because of the war in the early Ming Dynasty, there were no people in North China, East China and Central China. The local population density in Shanxi accounted for about 60% ~ 70% of the whole country (probably, I forgot) because of the terrain. When the court saw that it was impossible and no one else was there, it began to organize immigrants. You also know the plot that ancient people were willing to leave their hometown. When officials see it, few people think about it. The next day, the official put the words in front of him. As a result, everyone under the big locust tree was willing to leave and sent troops to help the immigrants. That's too sad. They had to leave immediately without anything, and as a result, the local people broke the branches of the locust tree as a souvenir.

After writing so much, add a little refinement.