Westward Expansion and Antebellum Era (jan 1, 1828 – jan 1, 1860)

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As Manifest Destiny motivated westward expansion in the United States, the debate over slavery became fiercer as Northern and Southern states grappled for political power. The conflicts over whether to allow slavery in the new Western states led to bloody conflicts such as the Mexican-American War and Bleeding Kansas, and eventually led to the Civil War when the South seceded to preserve slavery.

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