It is characteristic of this discovery that it was made, not in Charleston, but in London. Naturally, in America everyone knew that from 1846 to 1861 a free trade system prevailed, and that Representative Morrill carried his protectionist tariff through Congress only in 1861, after the rebellion had already broken out. Secession, therefore, did not take place because the Morrill tariff had gone through Congress, but, at most, the Morrill tariff went through Congress because secession had taken place.
Karl Marx was strongly pro-Northern in sympathy, as even a cursory reading of his wartime writings on the subject will reveal. He considered it a war of capitalist against feudalist, and naturally chose to approve of the more dialectically advanced antagonist.