Your questions miss the point. The Confederate states wanted to be free from federal economic control. Such a freedom is not an individual liberty that would be conferred by the state upon its citizens but rather an organizational mainstay that would define the state’s relationship with the federal government.
Slavery was the tipping point but the conflict goes much deeper than that.
The only federal economic control they objected to was the abolitionism movement that would rid them of slaves. At an extreme stretch, maybe you could claim objections over federal industrial policy and internal improvements, but you'll have to observe that there was zero mention of this in their ordinances of succession, they were avid supporters of this on the state level, and despite their constitutional prohibitions against it, they enacted such policies during the Civil War due to their abysmal infrastructure. And as a footnote, it is worth pointing out that a large part of the animus against internal improvements is driven by fear of the dilution of wealth in the slaveholding elite.
Slavery was the tipping point but the conflict goes much deeper than that.