Why do people with the same surname always say "We were a family 500 years ago"?

In life, when you meet some people and say hello, if you have the same surname as yourself, you will say: We were a family 500 years ago. Why is there a saying that it was a family 500 years ago? Was it really a family 500 years ago?

The phrase "five hundred years ago was a family" probably became popular in the late Qing Dynasty and the Republic of China. If we go back from this time, we will find that 500 years ago was almost the end of the Yuan Dynasty and the beginning of the Ming Dynasty. What happened at the end of Yuan Dynasty and the beginning of Ming Dynasty? What impressed future generations so deeply?

At the end of Yuan Dynasty and the beginning of Ming Dynasty, China held the largest migration in history. Why do you want to emigrate? It is precisely because of the consequences of the war that "white bones are exposed in the wild, and there are no crows in a thousand miles." The whole of Henan and Anhui has been abandoned, and there is no one on the land. Where did you emigrate? From Shanxi, because Shanxi is surrounded by mountains, there are few wars and many natural people. Thus, the magnificent 50-year immigration began.

At that time, Shanxi had a large population and a rich population. Many people don't want to emigrate. What should we do? Zhu Yuanzhang adopted forced immigration and wanted to stay in his hometown. No, you have to go. The officers and men bound your hands and feet and escorted you away. So now people in many places have the habit of walking with their hands behind their backs, especially the elderly. This is the habit of immigrants to stay.

Another point is that some places say "relieve yourself", which means going to the toilet. Now many places are still saying, how did this happen? At that time, because of forced immigration, my hands and feet were tied together to prevent escape. When I'm on the road, someone must have to go to the bathroom. First of all, I have to tell the officers and men to untie the rope in their hands, such as "I want to go to the toilet, you untie my rope."

As a result of immigration activities, many Shanxi people moved to various places, which is the reason why "ask where my ancestors are, Shanxi Hongtong locust tree". So 500 years later, people with the same surname met and said that they were a family 500 years ago. Maybe their ancestors really came from one place. Have you ever been to the locust tree in Hongdong, Shanxi? Where did your ancestors move here?