During the Xinhai Revolution in 1911, Outer Mongolia declared independence from China and formed the Bogd Khanate. In 1912, the Republic of China was established. Although many people of Inner Mongolia sought to accede to the new state, China retained its control over the area and reasserted control over Outer Mongolia in 1919. Consequently, Mongolia sought Soviet Russian support to reclaim its independence. In 1921, both Chinese and White Russian forces were driven out by the Red Army of the Soviet Union and pro-Soviet Mongolian forces. In 1924, the Mongolian People's Republic was formed.