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Continue to ChatThe Ryukyu islands as the center of the world http://ringmar.net/irhistorynew/index.php/welcome/introduction-2/2-1-the-warring-states-period/2-2-the-development-of-the-chinese-state/2-3-the-overland-system/2-4-the-tribute-system/2-5-a-japanese-international-system/the-ryukyu-islands-as-the-center-of-the-world/