Anti-Slavery Movement

Caption: The antislavery movement sought to end slavery legally and legitimately, through the course of law. They were strong proponents of legislation that would stop the expansion of slavery, for example. There were those in the antislavery movement that proposed legislation that would actually purchase the freedom of slaves, as had happened in Europe. This sort of solution would have ended slavery, but done it without the violence and death that the Civil War brought.
Source:
http://www.scotland.gov.uk/Resource/Img/172082/0052127.jpg
http://www.thehistoryguru.com/the-rise-of-the-abolitionist-movement-as-a-cause-of-the-civil-war/