If a resource-rich nation such as America or Canada reverted to a pacifistic anarchistic state, how would it defend itself against an organized invasion by a foreign authoritarian state. A likely scenario being that China or Russia would, having depleted their own resources by the late century, make a play to cease North America’s rich resources. How would informal anarchistic militias defend against a disciplined and technologically advanced land/air/sea/space army of millions of men with access to satellites, drones, and nuclear/chemical/biological weaponry?
There are so many assumptions in this question that need to be unpacked before we could give you proper anarchist answers. You might find something like what you’re looking for here: http://globalguerrillas.typepad.com/