What article of the US Constitution gives the feds the power to prevent secession.That anyone thinks the 9th and 10th Amendments afford a "right" to secede is a joke. That is revisionist "history".
The Constitution that each and every state agreed to has a mechanism to join the Union and no mechanism to leave. They agreed to that. Claiming some vague right floating out there that no one talked about before they started to think about leaving is ludicrous.
...and the claim that federal overreach is equivalent to the actual enslavement of people is...fanciful...but a necessary position to take to maintain a fantasy view of the past, I guess.
I'll wait.