Someone really ought to have told the Confederacy that states are allowed to secede.
The Confederate Constitution - Essential Civil War Curriculum
Though the Confederate nation was born out of secession, there was no right to secede in their national charter. During the constitutional convention, James Chesnut proposed that nullification be recognized as an appropriate remedy for disputes between states and the national government, but this idea was rejected. Benjamin Harvey Hill of Georgia tried to introduce secession as remedy for such disputes after a period of waiting, with Chesnut seeking to amend the proposal to include a simple right of secession, but both proposals were tabled and never raised again.[5] If states’ rights was the principal constitutional principle and the dominant political philosophy of the Confederacy, as has often been argued by historians, the constitutional convention, and subsequent wartime constitutional cases before state courts, provided excellent opportunities to assert this principle. The rejection of a constitutional right to nullification or secession may seem contradictory given that southern states had wielded secession just months earlier as a means for leaving the Union. Yet, many Confederate framers and their constituents were confident that improvements incorporated into their new constitution restored American constitutionalism and introduced innovations that addressed antebellum constitutional conflicts and militated against a future need for secession.
Constitution of the Confederate States; March 11, 1861 (yale.edu)
Preamble
We, the people of the Confederate States, each State acting in its sovereign and independent character, in order to form a permanent federal government, establish justice, insure domestic tranquillity, and secure the blessings of liberty to ourselves and our posterity invoking the favor and guidance of Almighty God do ordain and establish this Constitution for the Confederate States of America.
Or perhaps that the people of say, the Western part of Virginia had the right to not be forced into leaving the Union against their wishes. West Virginia - Separation from Virginia - Wikipedia.