Westward Expansion

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Louisiana Purchase

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The acquisition of the Louisiana territory by the United States from France in 1803.

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Meriwether Lewis

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An American explorer known for his role as the leader of the Lewis and Clark Expedition.

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William Clark

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An American explorer who co-led the Lewis and Clark Expedition.

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Northwest Passage

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A sea route connecting the northern Atlantic and Pacific Oceans through the Arctic Ocean.

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Corps of Discovery

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The unit of the United States Army that formed the nucleus of the Lewis and Clark Expedition.

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Sacagawea

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A Lemhi Shoshone woman who helped the Lewis and Clark Expedition achieve its chartered mission objectives.

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Zebulon Pike

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An American brigadier general and explorer for whom Pikes Peak in Colorado is named.

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Pike’s Peak

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A mountain in the Front Range of the Rocky Mountains, named after explorer Zebulon Pike.

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Mountain Men

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Trappers and explorers who roamed the North American Rocky Mountains from about 1810 to the 1880s.

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John Jacob Astor

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An American businessman, merchant, real estate mogul, and investor who was the first prominent member of the Astor family and the first multi-millionaire in the United States.