It is your logic that doesn't make sense.
Read the 10th Amendment. The whole concept is fairly simple: The states give a PORTION of their sovereign power to the National Government. ONLY those powers that are spelled out. The rest they reserve to themselves. If the Government abuses those rights, a state may take back that ower.
Read John C. Calhoun, the man was a genius.
"The states give a PORTION of their sovereign power to the National Government."
And, arguably, the power to join into a separate confederation was in that portion.
"Read John C. Calhoun, the man was a genius."
Yeah. Real genius. Argued fervently that folks like me are too dark-skinned to exercise self-government--and that was at the core of his arguments regarding "state's rights."
The entire intent of secession was to set up a totalitarian state with but one goal--keep slavery viable by externalizing costs from those who actually owned slaves to the public at large.
Hitler was a genius too. So what? At any rate Madison said it very clearly. Once in the Union always in the Union. The only legitimate means of getting out is through an amendment allowing it. The tenth amendment has NOTHING to do with secession in fact ALL the Founders adhored the concept. Washington's Farewell Address was primarily a condemnation of the idea and it described exactly the kind of people who would push the idea.