I wasn’t just referring to the election of 1860. The Civil War did not start in the 1860s. The roots of the Civil War go back decades earlier. The Nullification Crisis (when South Carolina basically said F-U to Federal tariffs) was in the 1830s.
In the 1860 election, both the Northern and Southern Democratic platform on tariffs are admittedly rather vague (and as you point out, they aren’t really that much different from each other, except for the issue of slavery).
The Republican platform isn’t quite so vague, however.
[QUOTE=1860 Republican Platform]
That, while providing revenue for the support of the General Government by duties upon imports, sound policy requires such an adjustment of these imposts as to encourage the development of the industrial interest of the whole country; and we commend that policy of national exchanges which secures to the working men liberal wages, to agriculture renumerative prices, to mechanics and manufactures an adequate reward for their skill, labor, and enterprise, and to the nation commercial prosperity and independence.
[/QUOTE]
(bolding mine)
Eh? Where did that come from?
Slavery was by far the main issue in the South.
Southern political power was divided into two main groups, the southern plantation owners, and the small southern farmers. The plantation owners owned most of the slaves, so their position is really freaking obvious. They wanted to keep their slaves.
The small farmers didn’t want to keep their slaves because they didn’t have any (usually). You can argue that the big plantation owners were acting out of their own self interest and economic survival, but the small farmers had no such excuse. The small farmer’s support of slavery was simple racial hatred. They did not want blacks to have any political power whatsoever and did not want them to have any place at all in southern society. They wanted them kept as slaves, beneath southern society, with no voice, no rights, no nothing. And to be fair, while you might be able to make the argument that the plantation owners were acting for the survival of their plantations, the simple fact remains that they had just as much racial hatred for the blacks as the small farmers.
The northern side in the Civil War is a bit more complex, but the southern side is dirt simple. It’s all about slavery, and not just slave labor, but keeping blacks completely under control and treating them as sub-human.
Anyway, going into great detail regarding all of the factors that fed into the Civil War is probably a bit beyond the scope of this thread. The OP was just questioning State first vs. US first, and I was just attempting to address that.