[BroJoeK]

DiogenesLamp: "Tariffs were only one part of it, and a focus on 'tariffs' simply has the effect of causing people to ignore what would happen to New York's trade once the South got out from under the anti-competitive laws such as the Navigation Act of 1817, The Warehousing Act, Subsidies for Northern Shipping and other industries, and the Biased tariff system which heavily favored the North."

First notice DiogenesLamp here wishes to draw our attention away from not just "slavery, slavery, slavery" but also "tariffs, tariffs, tariffs", towards what?
Well, towards those super-secret real reasons that nobody ever heard of before: the 1817 Navigation Act, the 1846 Warehousing Act, mail subsidies to a small number of high-tech steamers and oh yeah, "biased" tariffs.

But the real problem was none of those, DiogenesLamp tells us, rather was those evil, wicked, power hungry, oppressive, every-name-in-the-book, Northeastern "Industrial interests", previously called "power brokers" and "financial interests", but for today they are "Industrial interests".
And they are the "real reasons", regardless of what every Fire Eating secessionist ever wrote or said about it, DiogenesLamp just knows what was really behind it all.

How dos he know?
Well... he's just special, that's how.

[DiogenesLamp]

First notice DiogenesLamp here wishes to draw our attention away from not just "slavery, slavery, slavery" but also "tariffs, tariffs, tariffs", towards what?

The real issue. The money from European trade that would be lost if the South began direct trade with Europe. It is the reason the North had to stop them. If they did not, there was about to be a major power shift to the South.