China’s history is complex and even inside China we often quarrel with each other.
For example, Shu is now known by you as part of Three Kingdom. But in China’s history, Shu was a highly independent civ in Southwest China since 5000 years ago.
It had Cancong Dynasty (their offsprings became Qing Qiang people in history, in three Kingdom era, they performed as knights for Shu Han, which mainly become today’s southwest Han Chinese, they have different lookings and traditional clothes from other Han Chinese), Boguan Dynasty (they accepted Central Empire and their offsprings founded Bai kingdom in central China, their offsprings in morden time use Bai as their familiy name), Yufu Dynasty (they are the seeds of Xia people and they accepted the Central Empire too, their offsprings founded Yu kingdom near Wei river, and their offsprings use Yu as their family name), Pubei Dynasty(Their offsprings are west Viet people and now become a part of Yi people, their ancient language is similar to Vietnamese), Kaiming Dynasty (The direct offsprings of Xia people, when Shu was conquered by Qin Dynasty, some of them retreated to their land in South and founded the Shu Dynasty of Vietnam). And in the following history, this place was indepent again and again, what I can remember including Gongsun Baima, Shu Han, Cheng Han, Qian Shu, Hou Shu, Ming(Chongqing, not Ming Dynasty), South Ming, Daxi and many smaller kingdoms which own part of traditional Shu area like Dian, Yelang, Cuan, Nanzhao, Dali. In morden time, China separated traditional Shu area into many parts of Sichuan, Chongqing, Yunnan, Guizhou, Southest of Gansu, South of Shan’xi and give up some of their lands in northeast India, north Burma, north Vietnam, just because they don’t want traditional area of Shu to get indepent again.
Kaiming Clan claimed they are the offspring of Qi (the founder of Xia Dynasty whose name is also called Kai, because in history we couldn’t call the name of the Son of Heaven directly, we need to use another word with similar sound or meaning instead of his real name).
Yufu Clan claimed they are the offspring of Yu (the father of Qi, a hero who overcame the great flood).
And Baima Tibetan claimed they are the offspring of Gun (the father of Yu, who failed to manage the flood and was killed by one of the five empirors.)
Here you can see that partial Tibetan, Southwest Han Chinese, Yi people, Vietnamese claimed they have the same ancestor which also matches their gene and languages. I know many people will disagree, but I won’t spend time in meaningless debating.
At least I think it’s proper to keep Shu as an indepent civ.