Hello? What does a Supreme Court decision in 1869 have to do with secession in 1860? Nothing.
Actually everything. You don't seem to understand how the law works.
What I see here is a decision based on assuming what will "occur to every mind", and referring to the Constitution in general, but no REAL basis for the decision.
Thats nice. Yet again, the USSC is the law of the land. You not liking their opinion doesn't make it not law.