But remove the southern consumers, which according to information posted accounted for roughly one third of the total in 1860, and wouldn't that mean that exports did grow? If the dollar figures remain about the same or grow slightly on a smaller customer base and that would seem to indicate a substantial increase.
If the Southern consumers were removed, the North and West should have imported 67% of the base 1860 figure if the war and tariff had no effect on them. That 67% is based on the split of consumed imported goods by regions reported by Kettell in 1860. Instead, the North and West import less than this in the war years.