[central_va]

If a state(s) wants to secede it is their right, the opinions of the rest of the USA as to the reason why they want to leave mean doodly squat.

To you the last secession was about slavery, you are mixing up cause and effect.

[BroJoeK]

central_va: "If a state(s) wants to secede it is their right, the opinions of the rest of the USA as to the reason why they want to leave mean doodly squat."

I'd say you've pretty well expressed the attitude of Slave-Power secessionists in 1860 & 1861.

By sharp contrast our Founders in 1776, in their Declaration of Independence, said:

" ...a decent respect to the opinions of mankind requires that they should declare the causes which impel them to the separation."

Most Slave Power secessionists in 1861 didn't bother to publish their reasons for secession, but for those who did*** it was almost entirely a potential threat to slavery represented by the recent election of mildly anti-slavery Republican Abraham Lincoln.

***if you do a word search, you'll find the words "slave" or "institut" appear nearly 100 times in these documents.
The word "tariff" does not appear and "tax" only once: a tax on slaves.

central_va: "To you the last secession was about slavery, you are mixing up cause and effect."

Sorry, but it's you who are confused.
Without exception, secessions documents explaining their reasons show slavery as the main, if not only reason for disunion.