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Manifest Destiny - The 19th-century belief that the United States was destined to expand across the continent.
Louisiana Purchase - Acquisition of territory from France in 1803 that doubled the size of the United States.
Oregon Trail - A 2,170-mile route used by pioneers to travel to the western United States during the 1800s.
California Gold Rush - A period of mass migration to California in search of gold, beginning in 1848.