"In the politics of the world, the two jealous, if not hostile, sections of the Union will now neutralize each other. In the trade of the world, they will both be losers together."
Of course this prophecy proved false, at least as far as the North is concerned. By 1900 American commerce and industry surpassed that of Great Britain by wide margins. I'm not defending the tariff, but it's only fair to note that measure as a success for those in the North who sponsored it.