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John Brown is at it again. Brown and 21 of his followers atacked a federal arsenal in Harpers Ferry. He was captured during the raid and later hanged, but not before becoming an anti-slavery icon.
http://www.historynet.com/raid-on-harpers-ferry

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Admitted California as a free state.Organized Utah Territory and New Mexico Territory The slave trade was abolished in Washington, D.C. (but not slavery itself), and the Fugitive Slave Act was strengthened (but not enforced in the North).
http://www.historynet.com/?s=compromise+1850

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Treaty of  Guadalupe Hidalgo: added Callifornia, Oregon, as non-slave states. It also added, Southwest territories which would become Utah, Arizona, New Mexico.  Established Rio Grande as Mexico-U.S. Border.  http://www.historynet.com/?s=mexican+cessation

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Adding another slave territory to the U.S.
http://www.historynet.com/?s=mexican+cessation

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White men have a God-given obligation to spread their civilization across the U.S. http://www.historynet.com/?s=manifest+destiny

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Border Wars between slave-owners and free-soilers to sway vote for slavery in Kansas and Missouri. http://www.historynet.com/?s=bleeding+kansas

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Overturns the MO Compromise, rules it unconstiutional. Slaves are not citizens.

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Slavery is legal under the 36'30' Line, and illegal above it.
http://www.historynet.com/?s=missouri+compromise