The Alaska Purchase in 1867 added territory to the United States.
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The Declaration of Independence was signed in 1776.
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The Roswell incident sparked decades of extraterrestrial speculation.
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In 1835, New York newspapers published a series of fabricated articles about life on the Moon.
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The Indus Valley Civilization built advanced drainage systems.
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The first dinosaurs appeared during the Triassic period.
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Some early mammals coexisted with dinosaurs.
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The Magna Carta influenced later democratic principles.
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