[4CJ]

Article I, Section 10 and Article IV, Section 3 both make it clear that Congressional approval is required for changes in a state's status. Implicit in that is approval to leave as well. Or so the Supreme Court found.

'Clear', 'Implicit'. So in other words you nor the court could find any legislative power prohibiting secession, or anything laying out in detail any legal procedure regarding the same. I thought so.

[Non-Sequitur]

Clear', 'Implicit'. So in other words you nor the court could find any legislative power prohibiting secession, or anything laying out in detail any legal procedure regarding the same. I thought so.

The court did. Chase was quite clear that entering the Union could be legally revoked only through consent of the states. In other words, the same method through which they joined in the first place. Which goes back to Article IV.