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  Thomas Jefferson had made the missouri compromise.
The key point of the missouri compromise had been so missouri could be a state. - 
  
  Banned Slavery in the Mexican Cession
James K. Polk had been the man that had caused the wilmot previso. - 
  
  It was to deal with the spread of slavery to territories in order to keep northern and southern interests in balance.
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  Called that because of the violence and bloodshed between pro- and anti-slavery groups.John Brown was one of people involved,
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  the act of Congress in 1854 annulling the Missouri Compromise, providing for the organization of the territories of Kansas and Nebraska, and permitting these territories self-determination on the question of slavery.
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  Dred Scott sued for his freedom because his owner took him to free territory. The Supreme Court said he was still a slave, slaves were property, and the 5th amendment protected the right to own property. Any law banning slavery was therefore unconstitutional
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  John Brown and 18 men attacked the base. They were going to arm the slaves for a rebellion.Happened on the Harpers Ferry