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In 1775 the Pennsylvania Abolition Society was the first abolitionist group in what is now the USA.
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11 million slaves crossed the Atlantic, a trip known as the middle passage.
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The Missouri compromise of 1820 prohibited slavery north of 36-30 line.
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He sued for his right to freedom based on the fact that he had lived in a free state.
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Issued during the civil war by President Abraham Lincoln on January 1, 1863
