Organization of the Mongol Empire under Genghis Khan it also strengthened Mongol society as a whole. Genghis Khan’s united Mongol nation formed the foundation of the largest continuous land empire ever known. A wise statesman, Genghis also established Mongolian-style democracy that respected the ethnic and cultural diversity of his Empire. His government left many long-lasting legacies: Genghis Khan preferred to rule through existing hierarchies, but where he was resisted he destroyed the existing aristocracy. Nevertheless, he created at the same time a rough meritocracy among the Mongols. Positions of honor were given on the basis of bravery in battle or outstanding loyalty, as opposed to the old system
Kublai Khan essence of multiculturalism were Mongols, Semu, Koreans, Hui and Chinese people. Because the Wokou extended support to the crumbling Song dynasty, Kublai Khan initiated invasions of Japan. The court of Goryeo supplied Korean troops and an ocean-going naval force for the Mongol campaigns. Despite the opposition of some of his Confucian-trained advisers, Kublai decided to invade Japan, Burma, Vietnam, and Java, following the suggestions of some of his Mongol officials. He also attempted to subjugate peripheral lands such as Sakhalin, where its indigenous people eventually submitted to the Mongols by 1308 after Kublai's death. Kublai Khan twice attempted to invade