Which of the following MOST influenced the Southern states to form the Confederacy? A They didn't want to be a part of the Union anymore, because they wanted to elect their own Democratic president. B They didn't want to be a part of the Union anymore, because they didn't want to have to follow the Northern laws. C They didn't want to be a part of the Union anymore, because they believed slavery should be allowed in new states. D. They didn't want to be a part of the Union anymore, because they wanted the Northern states to have slavery.