Reason: Simply put, the reasons for Mongolia's independence are very complicated, including the encouragement and help from Russia, as well as the scuffle between warlords in China at that time and the lax national defense. The popular theory of national self-determination at that time also played an important role.
However, we can't ignore that the living buddhas and princes of Outer Mongolia at that time were greatly disappointed with the overbearing behavior and indifferent attitude of the Beiyang warlord government, which made the Outer Mongolia, who had the intention of returning twice, reluctantly leave the territory of China.
Extended data
National origin
Before the rise of the Mongols, Mongolian land was ruled by nomadic peoples such as Xiongnu, Xianbei, Rouran and Turkic, and the capital of Anbei was established here in the Tang Dynasty. According to historical research, Mongolians originated from the Donghu branch of Wu Meng Shiwei.
Before the 7th century A.D., Mongolian ancestors lived along the Ergon River, and later moved westward to the Bourhan Mountain (Grand Kent Mountain) and the Krulen River in the upper reaches of the Erne River. By the12nd century, Mongolians had scattered in the upper reaches of three rivers, such as Enen River, Krulun River and tuul river, and in the east of Kent Mountain, and some tribes, such as Qiyan, Zadalan and Taichiwu, had evolved.
In addition, there are Tatars, Dohorati, Milqi, Mobianla, Kelie, Naiman and Wang ancients in the Mongolian grasslands and forest areas around Lake Baikal.
Nomadic people on the grassland are called "tent people", mainly engaged in animal husbandry; People who live in forest areas are called "forest people" and mainly engage in fishing and hunting. In the 1 1 century, an alliance led by Tatars was formed, so "Tatar" or "Tatar" once became a general term for various parts of Mongolian grassland.
During the Song, Liao and Jin Dynasties, the Mongolian part of Mobei was called Black Tatar, and the Mongolian part of Monan was called White Tatar. /kloc-At the beginning of the 3rd century, Genghis Khan unified all the Mongolian ministries and gradually merged into a new national identity, and "Mongolia" changed from a tribal name to a national name.
Baidu encyclopedia-Mongolia