The Mongolian Revolution of 1911 occurred when the region of Outer Mongolia declared its independence from the Manchu-led Qing China during the Xinhai Revolution. A combination of factors, including economic hardship and failure to resist Western imperialism, led many in China to be unhappy with the Qing government. When a new program to settle Mongolia with ethnic Han and assimilate the natives was unveiled, it was met with resistance that resulted in Mongol independence from the Qing Empire. Many Barga and Inner Mongolian chieftains assisted in the revolution and became the revolution's leaders.