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The Wilmot Proviso was a document that tried to prevent slavery from being practiced in the territory won from the Mexican War. It didn't passs inciting more debate over the issue of slavery.
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Harriet Tubman escapes from slavery and becomes one of the most effective and celebrated leaders of the Underground Railroad.
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The continuing debate whether territory gained in the Mexican War should be open to slavery is decided in the Compromise of 1850: California is admitted as a free state, Utah and New Mexico territories are left to be decided by popular sovereignty, and the slave trade in Washington, DC is prohibited.