He gets off on the wrong foot from the get-go in the headline in his search for accuracy. This was not a civil war, but a war between two separate nations. A civil war is a war between opposing factions fought within the same national borders.
Kind of like our borders now, think it can't happen?
That's what the losing side considered. The winning side considered it a civil war and the winners write the history.
That begs the question: What is a nation?
One of the crucial tests, IMO, is whether a "nation" is recognized by other nations.
AFAIK, Except for a few minor German principalities and, arguably, the Vatican, the CSA was never recognized as a sovereign nation.
LOL
If the South had won the war, that might make sense.
Since they didn't, they weren't.
Virtually no one recognized them. Had that happened, it would have turned out differently.
Merriam Webster defines rebellion as "open, armed, and usually unsuccessful defiance of or resistance to an established government." So can we agree that their acts were a rebellion?