More strawmen from you. You’re not very good at this.
“A state does not have to have permission to declare independence...”
A state can do whatever it pleases. That does not free it from the consequence of poor choices. The con-fed slavers chose poorly and paid a horrendous price.
“A state can do whatever it pleases. That does not free it from the consequence of poor choices.”
Bismark had views similar to yours but said it with more flourish: The most indifferent arguments are good when one has a majority of bayonets.
Later shortened to just “might makes right.”