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Bartolomeu Dias made his trip around the tip of Africa, finding the nations around it.
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Christopher Columbus, an Italian explorer sailing for Spain made his way in the ocean, trying to find Asia, but found what was really North America. There, he traded with the Natives, and started the Columbian Exchange.
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Starting the same year Christopher Columbus discovered America, (discovered once again used very loosely), and thus began the trading of food, spices, materials, animals, and even diseases throughout America and Europe.
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Although the exact date is unkown, Lief Ericksson explored the New World in the year 968 AD. He was son of the famous Viking explorer Erik the Red, and is famous for discovering the New World for Europe (although everyone knows that the Native Americans discovered it first)