The Morrill Tariff of 1861 more than doubled the tax on Southern imports. Southerners imported virtually all manufactured goods like, plows, shovels, hoes, axes etc...

Tariffs had been an issue from the very founding of the country as in the proposed tariff of 1789...

"Satisfied I am it will be particularly injurious to the Southern States, who do not and cannot manufacture, and must, therefore, pay duties on everything they consume...William Grayson, Virginia statesman.