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Daniel Boone made a road west across the Cumberland Gap in Kentucky, attracting thousands of Americans.
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Spain secretly gave Louisiana to France.
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France sold Louisiana to the US for $15 million, making America much larger.
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Lewis and Clark led an expedition to explore the continent and find a river to the Pacific Ocean.
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The military expedition was to explore the Southwest and investigate Spanish settlements.
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The trail was previously used in the fur trade business, but families started migrating to Oregon using the trail.
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They traveled to present-day Utah to seek religious freedom led by Brigham Young