Wikipedia
Pan-Mongolism is an irredentist idea that advocates cultural and political solidarity of Mongols. The proposed territory, called "Greater Mongolia" usually includes the independent state of Mongolia, the Chinese regions of Inner Mongolia and Dzungaria (in Xinjiang), and the Russian subjects of Buryatia. Sometimes Tuva, and the Altai Republic and parts of Zabaykalsky Krai and Irkutsk Oblast are included as well. , all areas in Greater Mongolia except Mongolia have non-Mongol majorities.
The nationalist movement emerged in the 20th century in response to the collapse of the Qing dynasty and the possibility of an independent Mongolian state. After the Red Army helped to establish a Mongolian People's Republic, Mongolian foreign policy prioritized seeking recognition of independence over territorial expansion. After the 1990 Mongolian Revolution ended Communist rule in Mongolia, a number of organizations have emerged that promote pan-Mongolism, but they have little popular support.