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1700s - early 1800s: Quaker leaders used sermons to change public opinion about slavery.
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1804 - All states NORTH of Pennsylvania had outlawed slavery.
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1807 - Congress banned the importation of Africans (for slavery) into the United States
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1817 - The American Colonization Society was created to address the needs of former slaves in the North.
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1800 - 1865: A secret network of safe houses and conductors who led slave to freedom in the North and Canada, led by Harriet Tubman.
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1847 - Frederick Douglass and William Lloyd Garrison published abolitionist newspapers.
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1857 - Harriet Beecher Stowe's novel, Uncle Tom's Cabin, is published, furthering the abolitionist movement in the North.