Here is a quote from Dr. Gutzman I got either from here or Facebook:
“….Dew’s APOSTLES OF DISUNION proves that Deep South secession was over slavery-related fears. Middle South secession, on the other hand, was due to Lincoln’s early unconstitutional acts.
….As Dew shows in his magisterial APOSTLES OF DISUNION, Deep-South secession commissioners’ appeal to the other southern states came down chiefly to ‘Secede with us, because Lincoln is a threat to slavery.’ Notice that no other state joined the Deep South in seceding in response to this call. Still, it was the Deep South’s call. It is incorrect to say that slavery wasn’t the underlying reason for secession of the Deep South states. Without Virginia, however, the CSA could not have put up a four-year fight in defense of southern independence.”