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The campaign for Kublai Khan to conquer southern China under the Southern Song dynasty were specified under the years between 1266 and 1276. This included the declaration of Kublai Khan as the new emperor of China in the year 1271 This was the start of the Yuan dynasty that was a rule incorporated with elements of both Han and Mongol influences. After successfully eliminating all resistance to the new Yuan dynasty, Kublai Khan wanted to expand his empire by attacking Japan and built around 300-600 vessels in preparation for the assault on Japan.