The Pentagon Papers revealed previously undisclosed details about U.S. involvement in Vietnam.
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The Vikings explored parts of North America centuries before Columbus.
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In 1942, a mistaken military exercise caused confusion along the U.S. West Coast.
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The Mongol Empire became the largest contiguous land empire in history.
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The Great Fire of London occurred in 1666.
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The Industrial Revolution began in the 18th century.
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The shortest recorded war in history lasted less than an hour between Britain and Zanzibar.
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The Persian Empire built an extensive network of roads.
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