Abolitionists were incensed by the Dred Scott Decision because they believed that it would put an end to the discussion over slavery in the territories. The Confederate States of America were established when the southern states seceded from the Union as a result of the growing rift between the North and South over slavery. Although the Confederacy's enslaved population was released by the Emancipation Proclamation of September 22, 1862, it would take another three years for Congress to enact the 13th Amendment, ending slavery in the United States.
Hope this helps. Have a good day Melly. :)