First, let me ask you a question. When did the new Confederate nation announce its tariff rates?
What were they in comparison to the new Morill tariff bill?
As to the Morrell Tariff of 1861, which only had a chance of passing after the Southern delegation left Congress, I don't see your point.
Are you saying that Norther Shipping interests reliant of foreign trade wanted high tariffs? That northern textile mills reliant on southern cotton wanted trade cut off? That northern bankers who had lent hundreds of millions to southern planters didn't want to be repaid? And even northern iron mills in Pennsylvania who most benefited from high tariffs rates on British pig iron wanted to close their markets in the south on manufactured goods?
You lost me somewhere.
Going to war was not a good thing for anyone, except possibly the slaves. And even that is open to debate.