I noticed that those import values were unsourced on that website, stainless. But assuming for the sake of arguement that it the figures are correct, then if the South accounted for almost 90% of all imports in 1860 and total tariff revenues were roughly $60 million, that would mean that the North accounted for only $6 million in revenue in 1860. So how could that $6 million figure grow to $110 million only 4 years later?