Two words on why there will never be a secession of states.
Social Security.
I don’t see Secession happening, not like way back when. The Secessionist populations in those states that might like to do it are concentrated in small areas while the great majority of the land in those states is occupied by people who would rather stay in the Union and who will fight. I do see Cities declaring themselves autonomous where Federal writ does not run. As for guerrilla war, it will be an urban phenomenon because the mountains and the swamps belong to the partisans of the Republic. It really depends on the army and a civil war might just be a war within the military as the Obama Generals try to side with the rebel cities and the rank and file side with the Republic. One sign that the War is already in motion is the mutiny of the generals who have told the President that they will not obey orders to quell an insurrection from the left.
If any state wants to leave the USA then they go with my blessing. Vaya con dios. AMF.