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The immediate effect of the end of the Mexican-American War in 1848 was the signing of the Treaty of Guadalupe Hidalgo, which resulted in Mexico ceding a significant portion of its territory to the United States. This included present-day California, Arizona, New Mexico, Nevada, Utah, and parts of Colorado and Wyoming. The acquisition intensified debates over slavery in the newly acquired territories, contributing to the sectional tensions that eventually led to the Civil War. Additionally, it marked a significant expansion of U.S. territory and influence in North America.

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2w ago

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