When did the Mongols gain control over all of China?

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The Mongols gained control over all of China in 1279.123

While the Mongol conquest of China began under Genghis Khan in 1211, it was his grandson, Kublai Khan, who completed the process. Following the fall of the Song capital of Lin’an in 1276, organized resistance continued in the south for several years. The final remnants of the Song court were defeated in March 1279, marking the first time in history that foreign invaders controlled the entirety of the Chinese empire.21