On 8 March 1421, the largest fleet the world had ever seen set sail from China. The ships, some nearly five hundred feet long, were under the command of Emperor Zhu Di's loyal eunuch admirals. Their mission was 'to proceed all the way to the end of the earth to collect tribute from the barbarians beyond the seas' and unite the world in Confucian harmony. Their journey would last for over two years and take them around the globe but by the time they returned home, China was beginning its long, self-imposed isolation from the world it had so recently embraced.
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