The Maryland Society for Promoting the Abolition of Slavery and the Relief of Free Negroes and Others Unlawfully Held, was founded in 1789. I am pretty sure this was the first open abolitionist group. Hope I helped. :)
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it was used to defend slavery when the slave owners would say it was their god given right to own slaves but used to oppose it when people would say that it was against God's will
John Quincy Adams is the answer