Why are people in the ancient north called conference semifinals?

In ancient China, Han people were called tribes other than Han people, which usually referred to nomadic peoples in the north and west of China, mainly including Xiongnu, Xianbei, Di, Qiang, Tubo, Turkic, Mongolian, Khitan, Nvzhen and other tribes, which meant contempt and referred to them as uncivilized and uncivilized peoples abroad.

In the chronicle of China, there is a story: In the 7th century BC/kloc-0, the Xia Empire was overthrown by the Shang Dynasty monarch "Tang" in the east, and the last Xia Emperor "Jie" was exiled to the Southern Dynasty after the defeat, and became a vassal of the Shang Dynasty, where he died three years later. At this time, it was discovered that Jie Li's son was having an affair with Jie Li's concubine. Tang thought it was extremely immoral, so he deprived Zhou of his inheritance and planned to punish him further. After learning the news, Sui and Zhou took concubines and fled to the far north, where they established their own tribe and quickly developed into a barbaric nation. His behavior of marrying his dead father and widowed wife has since become a traditional custom of this nation. Their religious beliefs are similar to those of the Xia Dynasty, such as offering sacrifices to the sun and the moon, slaughtering animals, watching the stars and divining, but they don't build houses, don't observe etiquette, wear left-handed robes, live as nomads, and often rob the lives and property of southern civilized people. Because of living in the cold northern wasteland, he was born with long body hair, so he was named "Hu Ren". Out of contempt, the Qin people renamed one of them "Xiongnu".