It was a rebellion.
This is precisely where we disagree, and this may very well be the crux of the entire disagreement. Some folks believe states belong, as in being the property of, to the Union. Others, like yours truly, believe that states are members, as in being sovereign, of the Union.
face it, N-S, "your side" was that of the OPPRESSORS;the southerners were the FREEDOM FIGHTERS, however much you may wish that the truth was otherwise.
free dixie,sw