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Lewis and Clark Expedition set off from Missouri to explore the American West

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Emigrants traveled in wagons trains along the trail

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Narcissa Whitman wrote daily account of her journey on the Oregon Trail

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In 1848 gold was discovered in California. 

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In 1820 land in the East was scarce and little was available for purchase that wasn't rocky and hard to farm. Struggling farms began to think about moving west where the land was better for farming