I don’t think you understand the concept of “Levying War” . lol
Given that the federal government has moved to be in a position where it denies the states almost all sovereignty (read the dissenting opinions of the SB 1070 case) and looks to be open to assisting in an invasion (termed 'amnesty' or 'immigration reform') it could well be argued that the federal government is itself such an enemy of the several states.