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  the south could not go over a certain line
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  rebellion lead by nat turner
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  the gag rule was a series of rules that forbade the raising, consideration, or discussion of slavery
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  a proposal to not let the south move for more land
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  a woman who helps the underground railroad
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  admitted California to the United States as a free state
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        the problem of slavery and the treatment of humans as property - 
  
  helped make any further accommodation between North and South nearly impossible
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  the addition of Kansas and Nebraska
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  people fighting for slavery and non-slavery
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  a slave was always property and could not change
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  propelled Lincoln's political career into the national spotlight.
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  Abraham Lincoln was elected to be president