John Brown led a very unplanned slave rebellion which failed and led to his arrest. John brown was later hung for this and was seen as a symbol of freedom in the North but hated by the South.
Dred Scott Case
Uncle Tom's Cabin was a novel written by Harriet Beecher Stowe about how slavery really was. This really sparked abolition in the north because women could relate to the mother in the book.
Fugitive Slave Law
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Bleeding Kansas was a series of violent events following the Kansas-Nebraska act caused by popular sovereignty. These fights mirrored the Civil War.
Election of 1860
Dred Scott was a slave who sued for his freedom after being free for two years. Dred Scott lost the case because slaves were considered property so he could not win based on the constitution, which angered Northern abolitionists.
The Fugitive Slave Law allowed and promoted people and police in the North to return free or escaped slaves with little to no evidence in return for a reward.
In the election of 1860 Lincoln won with a 40% popular vote and 180 electoral votes, this angered the south and sparked secession.