Time can change a lot. Genetic verification (Y chromosome) Han nationality and Tibetan nationality have the same ancestor, but they have been separated from each other for 5000 years. The Han nationality changed to an agricultural society, and those who were not suitable for eating wheat and rice were eliminated, while the Tibetans, on the contrary, retained the genes that were good at digesting meat. Chinese is developing into homophones. While Tibetan develops into pinyin.
Due to the unification of Chinese characters, although the Han people in various places have differentiated and absorbed other ethnic groups, they have not yet split into different ethnic groups. This is very rare. Compared with the ancient Miao nationality, it is divided into Miao nationality, Yao nationality and She nationality.
Some people speculate that the Han nationality is not pure for some purposes. In fact, from large ethnic groups to small ethnic groups, they all intermarry with other ethnic groups actively or passively, and there is no such thing as a healthy "purebred" in the world. If the so-called pure bloodline is maintained, it can only be consanguineous marriage, or even father-daughter marriage. China also has such a sad example. Southwest ethnic minorities, such as Bulang people, marry their close relatives in green, and eventually the whole village is either stupid or sick. This country is going to decline.
The most important thing for a nation is psychological identity, which is based on certain cultural customs, but the origin is relatively unimportant.
So please respect those who split the nation (maybe you didn't mean to). Safeguard national unity and national prosperity.