According to Gavin Menzie China circumnavigate the World in 1421 based on evidences he presented like shipwrecks and ancient maps, to local peoples accounts and their DNA.

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..When they returned Zhu Di lost control and China was beginning its long, self-imposed isolation from the world it had so recently embraced. The great ships rotted at their moorings and the records of their journeys were destroyed. Lost was the knowledge that Chinese ships had reached America seventy years before Columbus and circumnavigated the globe a century before Magellan. They had also discovered Antarctica, reached Australia three hundred and fifty years before Cook and solved the problem of longitude three hundred years before the Europeans and last of all comes the biggest controversy. New Zealand historians have been the most apoplectic of all about my book. Anything that challenges Maori legend is to be resisted at all costs! Accepted New Zealand history has it that the foreign animals and plants found by the first Europeans were brought by the Maoris in their open canoes - that is, horses, pigs, dogs, rats and an array of plants from South America, North America, Asia and the Pacific. According to New Zealand historians, the Maoris traded all over the world.
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Source(s):
http://www.1421.tv/extract.htm

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