Congress cannot declare war against the United States of America.
I think you missed the point of my post entirely.
It will just escalate. From bigger and bigger police actions, to bigger and bigger Citizen responses.
Therefore, the full might of the US military going to war against fellow Americans has a well established and much respected precedent.
In point of fact, we haven't fought a congressionally declared war since WWII.
I'm sure that comforts the survivors in any of the countries we've shot up and bombed flat in the past 70 years or so...