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Many nothern states persuaded Congress to make slavery illegal
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After the Declaration of Independence, 1.2 million of black people were still slaves.
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Owing to the industrialization, Northern states remained the dominant sector, with small farms relying on free labour. However, the Southerns based their economy on large farms and relied on slaves as the main work force
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Southern slave owners held that slavery abolition would violate the principle of states’ rights, but Northerns believed slavery should be abolished.
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South Carolina announced the dissolution of its union with the other states, followed by Mississippi, Florida, Alabama, Georgia, Louisiana and Texas. They formed a Confederacy with a constitution based on slavery.
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Abraham Lincoln was a candidate for President on an anti-slavery platform.
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The American civil war broke out.
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The American civil war lasted and put an end to slavery with the 13th Amendment to the Constitution.