Even though the United States was founded on the idea of secession?
Mmmm... hmmm... not exactly. But that's an entirely seperate issue.
Virginia, Rhode Island, and New York were admitted to the Union under the pretext that they could secede at any time.
But in the election of 1836, the electorate gave its approval of the death of secession.
Shouldn't the question here be.... Is it worth having a war to stop a group of states from striking off on their own? This is one of those arguments that could go on forever. I don't see the rationale, but apparently some do.