You're forgetting one thing: that supply-line is right inside the disputed territory -- and the 'enemies', being Americans, will blend in with the general American population... this is one of the problems that makes Iraq, Afghanistan and the like so difficult, militarily speaking. If CWII kicks off, there's an instant vulnerability to guerrilla warfare.
I believe this is whey there's such a big push to confiscate guns; at that point they can justify firing on armed Americans on the basis of them being "law breakers". Their hope is to (a) disarm as many as possible [or at least legally justify the killing of them], and (b) do it rapidly, they cannot survive any protracted confrontation, especially one where more and more people will have their personal "line" crossed as time goes on.
>>You’re forgetting one thing: that supply-line is right inside the disputed territory — and the ‘enemies’, being Americans, will blend in with the general American population...
You’re forgetting another thing: half of those “americans” are quisling traitors who will turn the freedom fighters in in a second. They can do it anonymously by phone or by internet. They don’t need to be seen getting chatty with the police or ObamaCorps officers. Comparing an insurgency in modern America to one in the 18th century or in a third world shithole is apples and oranges.