Which group urged Southern secession?

Fire-eaters ...

During the American Civil War, the Confederate States of America consisted of the governments of 11 Southern states that seceded from the Union in 1860-61, carrying on all the affairs of a separate government and conducting a major war until defeated in the spring of 1865. Convinced that their way of life, based on slavery, was irretrievably threatened by the election of President Abraham Lincoln (November 1860), the seven states of the Deep South (Alabama, Florida, Georgia, Louisiana, Mississippi, South Carolina and Texas) seceded from the Union during the following months. When the war began with the firing on Fort Sumter (April 12, 1861), they were joined by four states of the upper South (Arkansas, North Carolina, Tennessee and Virginia).