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Jefferson chooses Lewis to lead first expedition across American West.
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Congress grants Jefferson's request.
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France sells Louisiana territory to Thomas Jefferson
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Jefferson Announces the Louisiana Purchase
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Lewis asks William Clark to share command of expedition.
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Corps leaves St. Charles; journey begins
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Sergeant Charles Floyd dies close to present-day Sioux City, Iowa.
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Sacagawea meets the Shoshone chief, her long-lost brother.
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Explorers vote on location of winter camp.
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Departure from Fort Clatsop.
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Return to St. Louis; journey complete