True, and if economic issues really drove the secession as confederate defenders maintain, Douglas was the man the South should have rallied behind.
They should have, but they could not because he opposed the Lecompton farce that was so popular in the South.
And, of course, it had nothing to do with economics.
Between 1850-1860 the price of cotton had run up to previously undreamed-of levels and Southern GDP per capita had increased 75% in the same period. The years before the war were one long economic boom for the South.
If there was any economic cause to the Civil War, it would have been that the South was wading in such a deep pool of cash that they believed they really could take on a section that had three times their white population.