It would not have mattered if they had. Allowing them to get beyond the economic control of Washington D.C. and the New York "Robber Baron" power brokers, was not going to happen. One way or another, there would have been a war to stop them, because Washington D.C. and it's New York Crony Capitalism partners will never let go of a significant amount of money.
The South at the time earned 3/4ths of all Export Revenue for the United States. Too much money for the establishment to let go of peaceably.
Such nonsense
Congress was controlled by Southern democrats. They passed the economic programs they desired