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Thomas Jefferson sends a secret message to Congress asking for approval and funding of an expedition to explore the Western part of the continent.
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News of the Louisiana Purchase is announced.
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Expedition members set up camp between the Missouri and Mississippi Rivers.
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The Corps of Discovery had their first encounter with Oto and Missouri Indians. (Natives)
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The Corps has a tense encounter with the Teton Sioux near today's Pierre, South Dakota; one of the Sioux chiefs waves his men off and conflict is averted.
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Corps members discover the Mandan village and build winter fort.
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The Corps hires Toussaint Charbonneau, as an interpreter of the journey.
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Lewis and another hunter killed a grizzly bear near the Yellowstone River in Montana.
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Lewis and Clark decided to head to the south when they come to a Missouri River.
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Discovers Shoshone, where Sacagawea recognizes the chief as her long-lost brother, Cameahwait.