It wasn't a civil war, nor was it a "war between the states".
Says you. Remember, you typing a claim doesn't actually make it so. You keep working under the assumption that anything you choose to believe must be immutable fact. When in reality, its just your personal opinion, citing yourself.
It's an important point because it highlights your ignorance of history and the nature of the conflict.
Or more accurately it highlights your personal opinion as nothing more than what you choose to believe. And rejects you citing yourself as defining the 'nature of the conflict'.
I hate to break this to you but you typing your opinion isn't actually evidence.
A civil war is when two factions contend for the control of a single government. Eleven seceding states were not trying to seize control of the government of the United States.
There is no such power to do so. With no mention whatsoever of secession in the Constitution. Any language preserving the right to secede was stripped from ratification documents of the States. The Supreme Court found that the status of the States as individual sovereigns changed when they joined under the constitution.
Remember, the right to secede was an Anti-Federalist argument. And the Anti-Federalists LOST. It was the Federalists that overwhelmingly wrote the constitution, with the chief Federalist, James Madison, writing the document. And James Madison explicitly rejected the idea of secession explicitly stating that the Constitution was adopted 'in toto and forever'.
And backing your case for secession?
You imagining it must be so. Citing yourself. Backed by jack shit as the constitution makes no mention of it.
So it was a rebellion. And the constitution most definitely mentions those.