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The Corps holds the first Independence Day celebration west of the Mississippi River.
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In the north of what today is Omaha they hold a council with the Oto and Missouri Indians.
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The expedition reaches the villages of Mandan and Hidatsa. Lewis and Clark decide to build their second strong winter across the main Mandan village, about 50 miles north of present-day Bismarck, North Dakota
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For the first time in the United States the men recorded the temperature of 45 deegres below zero
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The expedition names the three forks of mississippi Jefferson, Madison, Gallatin
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Jefferson receives the shipment from Fort Mandan. Lewis climbs to Lemhi Pass, in what today is the Idaho-Montana border. He expects to see a plain and a river on the other side of the summit, but instead there is nothing but more mountains.
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Lewis finds the Shoshone tribe and deals for horses. Leader Shoshone, Cameahwait, turns out to be the brother of Sacagawea
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In five canoes that pile up under the guidance of the Nez Perce, the expedition pushes downstream into the Clearwater River.
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after the expedition reaches the Pacific, the entire expedition votes on where to build their fort for the winter
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Clark takes a group by yellowstone and Lewis heads to great falls
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The expedition arrives in Sr. Louis after two years and four months of travel