The Union is based on the Constitution and that was what was in question.
There was never any real “sovereignty” of the states outside those allowed by the Constitution and rebellion is not one of them. This is one of the unique aspects of the document.
States had the power to leave a Confederacy, they had no such right under the Constitution.
Where in the constitution is a state forbidden the right of unilateral secession?
The states were sovereign before there ever was a constitution. They never surrendered their sovereignty. They only delegated certain limited portions of their sovereignty to the federal government and retained the right to reclaim those powers whenever they saw fit.
You once again display a total lack of understanding of US history and the Constitution. Please post the article and section making secession unconstitutional. We’re all waiting.....