The first abolition organization formed in the [[United States]] was the [[Pennsylvania Abolition Society]], originally known as the Society for the "Relief for Free Negroes unlawfully held in Bondage", in 1775.<ref>http://www.hsp.org/default.aspx?id=634</ref> Organizations such as these made use of the [[Underground Railroad]], a loosely organized system for secretly transporting southern slaves into the free northern states. Slavery was outlawed in the United States by 1865 by the passage of the [[Thirteenth Amendment]], although specific states abolished it starting in 1777. | The first abolition organization formed in the [[United States]] was the [[Pennsylvania Abolition Society]], originally known as the Society for the "Relief for Free Negroes unlawfully held in Bondage", in 1775.<ref>http://www.hsp.org/default.aspx?id=634</ref> Organizations such as these made use of the [[Underground Railroad]], a loosely organized system for secretly transporting southern slaves into the free northern states. Slavery was outlawed in the United States by 1865 by the passage of the [[Thirteenth Amendment]], although specific states abolished it starting in 1777. |