Awesome historian Tsering Shakya on the significance of the Xinhai Revolution for minorities on the edge of Qing China:
The Xinhai Revolution of 1911 and the subsequent founding of the republic sought to remould China as being composed of five nationalities: Han, Manchu, Mongol, Tibetan, and Uyghur. This vision of a multi-ethnic nation had no appeal to Tibetans and Mongols. In divergent ways, the Xinhai Revolution created an opportunity for China, Tibet, and Mongolia to create a modern nation state.
The revolution profoundly impacted China’s frontier regions. China’s authority disappeared, particularly from Tibet and Mongolia. Tibetans and Mongolians saw the overthrow of Manchu rule as an opportunity to free themselves from Qing colonialism. In the aftermath of the 1911 revolution, Tibet and Mongolia declared independence and became de facto independent states, remaining so until the mid-20th century. But only Mongolia achieved full recognition as a separate state while Tibet failed.
Independence from China brought Jazandamba, the Bodg Khan (spiritual and secular ruler), to power in a theocratic Mongolian government in the 1910s. Mongolian leaders shared the modernist goal of the Chinese revolutionaries and viewed traditional social structure as an impediment to modern nation status. Later Mongolian revolutionaries embraced the idea of the radical transformation of society and in 1921 became the first Asian country to declare a Communist revolution. Mongolia turned towards the Soviet Union in a strategic and ideological alliance.
Tibet, after expelling all vestiges of Manchu rule, became isolationist and any demand for social change was aggressively resisted. The death of the 13th Dalai Lama in 1933 left Tibet without leadership and plunged its ruling class into a power struggle, which further blinded them from developments occurring in China.
Between 1911 and 1949, the new regime in China was preoccupied with internal politics and faced resistance from Tibetans and Mongols. China was unable to reassert power in these two regions. Mongolia’s Communist revolution afforded Mongolians the protection of the Soviet Union and ensured its independence. Tibet remained independent of China’s rule between 1911 and 1950, although it never achieved de jure recognition.