The issue of slavery was intensified by the outcome of the Mexican-American War. An already divisive political issue was made even more controversial by the question of whether slavery could expand into the 700,000 square miles of territory acquired from Mexico. In the House of Representatives, northern congressmen pushed through the Wilmot Proviso specifying that slavery should be excluded in all territories won from Mexico. In the Senate, southern strength defeated this proviso. South Carolina Senator John C. Calhoun introduced instead a series of resolutions affirming that slaveholders had the constitutional right to take their slave property into any United States territory they wished." —National ArchivesPrologue: The Journal of the National Archives, Spring 2010, vol 42, no. 1.This passage illustrates the political difference between the North and South over the issue of

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