Some people say that after many years of history of the northern Han are not pure Han, are mixed Han, a little more pure Han can only be found in the South, is there any truth to it?

China has been a multi-ethnic country since ancient times, from the legendary era of the Yellow Emperor, active in the Central Plains of the land on the many ethnic groups. The feudal system of the Xia, Shang and Zhou dynasties was actually a recognition of the dominance of slave owners of all ethnic groups. The traditional concept of China and Xia was formed during the Spring and Autumn Period and the Warring States Period, and the criterion for distinguishing between China and Yi was not blood but culture, which was a major feature distinguishing China from foreign countries. Later, the five hu chaotic China, the female invasion, etc., despite bringing in different blood, but it did not accept the conquest of the Chinese culture, whether female, Xianbei or Han people, and finally turned into a nation, are the Chinese. For example, the Tang Dynasty, some people say that this is the most glorious dynasty established in the history of the Han Chinese, but do not know that the Tang government many senior officials such as Changsun Wuji, Yuwen Shiwei, etc. have Xianbei blood, but you can say that they are not Huaxia?