If you research the tariff wars, and in particular the Tariff of Abominations, you will appreciate that the sentiment against tariffs was a lot stronger than you are suggesting. With the tariff at 48%, of course it wasn’t a burden if you don’t buy the taxed items but are forced to buy substitutes manufactured in the north.
Northern newspapers were sympathetic about allowing the southern states to secede, even applauding the idea with a “good riddance” thrown in to boot. That was before South Carolina reduced its tariff to 10% and the newspapers realized that would apply not only to foreign goods but to northern goods as well now that they were “foreign”. The newspapers screamed for war when the tariffs were reduced.
The big ticket item was capital goods that southern manufacturers wanted in order to industrialize.
I could go on but the role of tariffs is so well documented that you must choose to ignore them to dismiss that as a major issue that led to war.
Which would mean that any goods the South had bought from the North before the war would now be 10% higher. And it would have no impact on Northern imports from abroad.
Like what?
And you are right, many South hating Northern newspapers did say good riddance when the South left, until they realized that without Southern cotton and agricultural goods, their textile economy dried up. Economics, economics, economics.
Take a look at South Carolina politics. They were the only state that didn't count the popular vote for president. The state legislature chose the electors. There were property requirements for holding office, and wealthy planters distributed political positions among themselves.
In such a tight-knit polity it wasn't hard for panic and obsession about tariffs to take over, especially since John C. Calhoun, who originally favored the tariff, was agitating for nullification. In other, less elite-ridden parts of the South, it would have been much harder to gin up such indignation.
Northern newspapers were sympathetic about allowing the southern states to secede, even applauding the idea with a “good riddance” thrown in to boot. That was before South Carolina reduced its tariff to 10% and the newspapers realized that would apply not only to foreign goods but to northern goods as well now that they were “foreign”. The newspapers screamed for war when the tariffs were reduced.
Well, no. Firing on Fort Sumter had a lot more to do with changing Northern minds than Southern tariffs.
The big ticket item was capital goods that southern manufacturers wanted in order to industrialize.
Most of the promoters of secession were planters or professionals or possibly involved in finance. What few industrialists there were weren't that crazy about secession. Use your head, please: many of the industrialists in the South may not have objected to tariffs that would protect them against European competition. Of course, many of the industrialists owned slaves and slaves manned their factories, so there were industrialists who did favor secession, but Southern industry wasn't a major factor in the secession drive.