Shortsightedness of the southerners?
You are aware, aren’t you, that the northerners levied onerous tariffs on the south? Ninety percent of the money coming into the federal government was taken from the south.
Perhaps we can agree that the northerners were short sighted as well?
The nation was almost fully funded by tariffs. I have my doubts about the 90% and suspect you simply made that figure up on the spot. And there was no tariff on the south, it affected all states.
But the goal of the tariff was to protect industry growing in the north.
But tariffs were not the cause of the war. As much as you want to pretend, it all came down to slavery. Even the tariff you lament. It was more important to protect honest business than slave dependent industries.
If the southern agri-economy was not slave based, people might have thought it was worthy of protection.