[mrguyorama]

>For example remember the civil war was largely fought over protectionist trade policies for northern manufacturers.

That's a falsehood pushed by the south to deny their support of slavery. This short video about it from prager University is helpful: https://www.youtube.com/watch?v=pcy7qV-BGF4

Here you can read South Carolina's actual declaration of Succession, where they make a point of spending most of the 13 pages talking about how their "right" of slavery was being infringed upon: http://www.teachingushistory.org/pdfs/DecImmCauses.pdf

[_5ysi]

My previous reply is being down voted a lot so I'll try again and compare them.

These tariffs were effectively a tax on slavery and a redistribution of income from agriculturalists in the south to industrialists in the north. The major cause of the South's succession may have been slavery, but the immediate cause can still be these taxes which were putative to slavery. They didn't suceed in response to the emancipation proclamation.

[_5ysi]

Either way, my point is that tariffs and protectionism had profound economic impact benefiting the industrial north and Midwest at that time.

I'm not sure if people even at that time knew which of the two was the more prominent cause of the war.