The Columbian Exchange

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Columbus's voyage connected the Americas, Europe, and Africa in a web of exchange that transformed the environments of the Old World and the New World. In this video, Kim Kutz Elliott discusses the impact of the Columbian Exchange.

US history on Khan Academy: From a mosquito-ridden backwater to the world's last remaining superpower, the United States of America is a nation with a rich history and a noble goal: government of the people, by the people, for the people. Its citizens' struggle to achieve that goal is a dramatic story stretching over hundreds of years.

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