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The American Colonization Company proposed the idea freeing slaves in America back to Africa.
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Abolition started in states like New York and Massachusetts then later moved to other northern states.
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The Underground Railroad helped spread abolitionist in the North.
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The Missouri Compromise was designed to maintain an even balance between slave and free states.
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Another compromise was negotiated to resolve the question of slavery in territories won during the Mexican- American war.
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Union states (north) vs confederate states (south).
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Lincoln issued a preliminary emancipation proclamation, meaning slaves in any state should be free.