Personally, I think the history of Songyuan White Mongolia should be traced back to the Jindan Island incident. Fuxin area in Chaoyang, Liaoning used to be Zhuosuotumeng (East Tumote, where there are many Mongolians surnamed Bai), and many Mongolians live there. Because of the Jindandao incident at the end of 19, this incident had a far-reaching impact on the eastern Mongolians (it is said that it was also a factor leading to the independence of outer Mongolia), which led to a large number of Mongolians moving northward. Many Mongolians from Chaoyang, Liaoning and Fuxin are scattered in the northeast. I hope it helps you.