Lewis & Clark: The Ultimate Adventure

Lewis and Clark braved the unknown waters of the Missouri to chart America's future. As we approach the 200th anniversary of their sojourn, TIME reflects upon their sacrifice and achievement

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Surveying the Land

lewis and clark united states history

Vincent J. Musi / Aurora for TIME

Chief Arvol Looking Horse rests his horse during the Third Annual Chief's Ride. Looking Horse is a spiritual leader to both the Lakota and Dakota Sioux. The Standing Rock Sioux reservation winds from North Dakota into South Dakota, encompassing part of the Missouri River.

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