Technically, they were states of the CSA. I forgot to include you in my response to rockrr @ post 281.
Well, no... at the time they seceded, they were officially states of the United States.
At the moment of secession, they placed themselves in revolt against the established government, thereby satisfying the definition of "insurrection."
Really ... what a silly point of contention. Yeah, I know you're just trying to get around what the Constitution actually says, but the fact is that it was insurrection.