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Oxford Reference

Lewis and Clark Expedition (1804–06)

US expedition to seek a route by water from the Mississippi to the Pacific Ocean. Instigated by President Thomas Jefferson, it was led by army officers Meriwether Lewis and William Clark, with the assistance of a Shoshone woman, Sacajawea. It reached the Pacific at the mouth of the Columbia River and produced valuable information about the country and peoples of the Northwest.

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