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Thomas Jefferson sends a secret message to Congress.
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Lewis begins his training
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News of the Louisiana Purchase is announced.
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Lewis oversees construction of a keelboat.
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Lewis and Clark establish Camp Wood.
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Lewis and Clark travel to St. Louis to attend some ceremonies.
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The Corps of Discovery leaves Camp Wood.
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The Corps holds the first Independence Day celebration west of the Mississippi River.
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North of present-day Omaha, Nebraska.
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Sergeant Charles Floyd dies of natural causes near present-day Sioux City.
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The Corps holds a council with the Yankton Sioux at present-day Yankton.
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The Corps enters the Great Plains.
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The Corps has a tense encounter with the Teton Sioux near today's Pierre.
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Near today's Bismarck.
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Lewis and Clark hire French-Canadian fur-trader Toussaint Charbonneau and his Shoshone wife.
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The men record the temperature at 45 degrees below zero.
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The men finish building Fort Mandan.
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The Corps attends a Mandan buffalo dance.
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Sacagawea's son.
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Lewis and Clark send a shipment of artifacts and specimens.
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The Corps marvels at the abundance of game.
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One of their boats nearly overturns.
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The Corps reaches the White Cliffs region of the Missouri River.
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The Corps reaches an unknown fork in the Missouri and must determine which branch to choose.
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Lewis reaches the Great Falls of the Missouri.
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The expedition reaches the Three Forks of the Missouri which they name the Jefferson.
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Sacagawea recognizes Beaverhead Rock.
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Jefferson receives the shipment from Fort Mandan.
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Sacagawea recognizes the chief as her long-lost brother.
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Lewis' celebrates his 31st birthday and vows.
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The expedition sets out for the Bitterroot Mountains with many horses.
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The men camp near today's Missoula, Montana at a spot they name Traveler's Rest.
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The Corps begins the steep ascent into the Bitterroot Range of the Rocky Mountains.
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the men emerge from the mountains near present-day Weippe, Idaho, at the villages of the Nez Perce Indians.
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After learning a new method to make dugout canoes from the Nez Perce, the men push off down the Clearwater River near Orofino.
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The Corps must run their canoes through treacherous rapids at The Dalles and Celilo Falls.
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the last waterway to the Pacific Ocean.
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They are seeing only the widening estuary of the Columbia River.
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the encampment came to be called Fort Clatsop.
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winter of only 12 days without rain, the men present their fort to the Clatsop Indians and set out for home.
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Louis nearly two and a half years after their journey began and are acclaimed as national heroes.