Texas Annexation in the Antebellum Era

The annexation of Texas in 1845 was a pivotal event in American expansionism, sparked by the migration of American settlers into Mexican territory and the subsequent Texas Revolution. Tensions over slavery, territorial boundaries, and national sovereignty delayed its statehood for years. Its eventual admission to the Union under President John Tyler fueled sectional divisions over the expansion of slavery and directly triggered the Mexican-American War, reshaping the geopolitical map of North America.

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