10% of the Southern population needed slaves for economic and political reasons, while 90% of the Southern population needed slaves because it is part of their identity. As the Cotton Kingdom was built, the South's size, wealth, and population increased with slavery part of its economy. The American Colonization Society believed that equality between blacks and whites was not possible. They wanted to free them, but slowly, and send them to West Africa to gradually end slavery. The militant abolition movement agreed on the need to free slaves, but instead called for an immediate end to the injustice. They believed that African Americans should be considered equal members of American society, as they also helped take part in the creation of America. They transformed the idea of ​​what it means to be American not by race but by birth. With the onset of the debate over slavery and the changes brought about by the market revolution, the collapse of political parties and the outbreak of civil war occurred. The Dred Scott case was the Supreme Court's ruling on whether or not Dred Scott would be considered free from slavery having lived in free states for years. The Supreme Court voted in favor of John Emerson. The ruling was that Dred Scott was considered property because he was a slave and had no right to speak out. Another might be the Missouri Compromise