Why did the Mexican-American War ultimately divide the American public and provoke political dissension?

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The Mexican-American War ultimately divided the American public and provoked political dissension because many Northerners feared the spread of slavery to the newly acquired territories. The Wilmot Proviso, which proposed to ban slavery in any territory acquired from Mexico, was introduced in Congress, but it failed to pass. This led to increasing tension between the Northern and Southern states, with the North opposed to the expansion of slavery and the South insisting on its right to take slaves into any territory. This division eventually led to the Civil War.

Why Did the Mexican-American War Ultimately Divide the American Public