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America expanded through a combination of territorial acquisitions, treaties, and military conquests. Key events included the Louisiana Purchase in 1803, which doubled the nation's size, and the annexation of Texas in 1845, followed by the Mexican-American War (1846-1848), which resulted in significant territorial gains in the West. Manifest Destiny, the belief that the U.S. was destined to expand across the continent, fueled public support for these expansions. Additionally, railroads and westward migration played crucial roles in integrating and settling newly acquired lands.

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