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Fugitive slave law act of 1850
This law allowed South slave owner to arrest the slaves on run in North. This caused a great indignation in North.
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Uncle Tom's Cabin was published
This fiction exposed and accusing the darkness of the slavery, played an important role in increasing people's awareness about abolish slavery.
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Bleeding Kansas
Slavery had increased to the North, speed up the bourgeoisie internal differentiation, developed the contradiction between capitalism and slavery.
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Dred Scott Decision
Dred Scott lost his rights of being free of slavery so he asked court to bee free again, he had been free twice in other states, but court did not look for his petition because he did not own any property, this caused a lot North people angry and join the group of abolition slavery because the court stand in a position that support slavery.
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Abraham Lincoln was elected as president
Lincoln abolished slavery so that slavery would not beheld in any states and this led Southerns be violent rage which led the civil war broke out.
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