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Meriwether Lewis begins his training as expedition's leader in Philadelphia.
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The Louisiana Purchase was announced; Lewis wikk now explore new land owned by the US.
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Lewis picks up William Clark and other men as he travels down the Ohio river.
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Lewis and Clark establish Camp Woord, which is a winter camp for Corps of Discovery, on Wood River in Ohio.
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Lewis and Clark travel to St. Louis for ceremonies about Louisiana territory that belonged to the US.
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Lewis and Clark hire a French-Canadian fur-trader, Toussaint Charbonneau and Sacagawea as interpreters.
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Lewis and Clark finished building Fort Mandan, which are winter quarters in present-day Dakota.
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Lewis and Clark send a shipment of artifacts and specimens to president Jefferson.
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One of Lweis and Clark's boats almost turns over and Lewis credits Sacagawea for saving it.
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Lewis reaches the Great Falls of Missouri.
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Lewis and Clark reach three forks of the Missouri River.
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Sacagawea recognizes Beaverhead rock and knows they are close to Shoshone lands.
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Lewis and Clark discover that there is no Northwest Passage.
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The expedition reaches the Columbia river, which is the last waterway to the Pacific Ocean.
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After a winter that had 12 days without rain, they present their forsts to the Clatsop Indians and set out for home.
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Lewis and Clark found an easier route across the country and reached St. Louis in 2 1/2 years after their journey began.