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In 1492, what was the shortest distance you could travel to discover the new world from the old world? [closed]

In 1492, when Christopher Columbus brought the new world to the attention of the old world. What was the extent of the known world, and what was the shortest distance someone could have travelled to ...
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4answers
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Why did Christopher Columbus think he had arrived near Japan?

This question came to our mind as a long discussion in chat between some users over ELU including me and we thought to post the question here. Wikipedia states he thought he had arrived Japan. In ...
24
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4answers
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Why is Christopher Columbus credited for “discovering” America?

Even if we ignore the millions of native Americans who lived in the continent before Columbus "discovered" it, even if we ignore other civilizations (eg: Polynesians, Phoenicians, Chinese, Arabs, ...