You think the people in Mississippi who wrote that document knew that? (BTW-- mechanized cotton farming did not become profitable until the 1960s not the 1870's or 80's as you imagine. Share croppers were still picking cotton when Kennedy was president.)
The South's cause was not justified under any concept of Natural Law. Their 'institutions' i.e. Slavery, where not under any threat in 1860 other than confining it to their states where it was still legal. The fact is they could not tolerate the Republicans blocking further expansion. It was a mortal threat to them.
The Slave Power understood the economics of slavery. They understood the only reason slavery was profitable to them was because it was a Ponzi Scheme that required continual expansion into new markets. Block expansion of slavery, and they would be ruined.
Then how was the colonies cause justified? They were slave owners too.
Their 'institutions' i.e. Slavery, where not under any threat in 1860 other than confining it to their states where it was still legal.
And here is an admission that the Union was perfectly willing to accommodate slavery. So then, the war was not fought over slavery. Thank you. You've made my point. So then, Why did they go to war with the confederacy?
If not to eradicate slavery, what was their reasons for doing so?