Huh?
Works for me.
No Roman was willing to die for Rome anymore. It wan't worth it to them.
America is still strong and has a strong (and volunteer) army. But for how long? People do not join (and maybe die) in an army to protect Hillary Care, or abortion for any reason at any time or for confiscatory taxes or to turn in their private guns or for the rest of liberal socialism...
The author does not understand Roman history. We think of a republic's virtues as including peaceableness. The ancients thought otherwise. They considered one of a republic's primary virtues that it was more effective at warfare.
If Rome's back was to the wall throughout this period, it was because they kept moving the wall. The Roman republic was never peaceable. It was specifically organized for war and conquest. The primary job of the consuls was to command the armies. It is as if Commander in Chief was our President's main function, with everything else kind of an afterthought.
In the later Republic ordinary provincial governors, with Caesar and Crassus only the most prominent, would routinely start major wars on their own initiative without suffering any consequences except increased political status.