Did the Han people with purer blood, East and West Han people go to the south? There are more or less other ethnic elements in most parts of northern China?

There were two great migrations of Han nationality. The first time, it was called "Yi Guan Nan Du", which happened during the Five Chaos. When the Hu people entered the Central Plains, the Han people were forced to go south. At that time, rich nobles could cross the river. Because of the wide sleeves of Hanfu robe, it is called "the south crossing of the garment crown". The second time was called "Jian Yan Du Nan", which took place during the Jian Yan period of Emperor Gaozong in the Southern Song Dynasty. At that time, in order to avoid Nuzhen, nobles and people went south with Song Gaozong.