Do you know why the Yi people have lived in the mountains for generations?

Yi people originated in the southwest of China six or seven thousand years ago, when there was no great plain. Around 3000 years ago, various tribes were distributed in the whole southwest region, which once spread all over the center of Yunnan, Sichuan and Guizhou provinces and part of Guangxi. Its core area should be the vast area adjacent to the three provinces. I lived in bazi at first. At the end of the Song Dynasty, the Mongolian army was under siege and the Song Dynasty was teetering. After Genghis Khan unified the Central Plains and marched into the southwest, for a long time, the Southwest Yi regime became a big worry for the imperial court. Ethnic minorities with the theme of the Yi nationality have been conquered by the empire. The establishment of inspection departments in the Yi area forced the tribes to migrate while fighting until they collapsed or entered the mountains and forests. Yi culture is developed, especially astronomy, and the war has also led to the loss of a large number of cultures. Regional differences have caused the deviation of local languages, but it is not difficult to see the prosperity before being forced to disperse from the clues of ancestor worship such as language, Bimo, Yi musical instruments and Apu Trojan horse in southwest China and even Vietnam.