A confederation of national guards would not lead to civil war. That would only be the case if the national guards were not confederated. What I'm advocating is handing over the regular military to the national guard, and having more local control. Have cross-training and coordination between the various national guards in the confederation, and allow soldiers to transfer from one national guard to another. But, at the same time, have the national guard(s) independent of the centralized State or federal government, to keep politics out of the military.