I disagree with the idea that Roman infrastructure collapsed. What weakened Rome more than anything was the internal strife and civil wars that seemed to happen every 4 years. That along with the inward migration of the Germanic peoples bing pressed south of the Danube and into Roman territory not because they wanted to...because the Huns were scaring them south.
From a military standpoint, Rome had far more campaigns going on at one time than we could ever dream of. Not only did Rome face a constant war on the Danube...they faced it on the Eastern frontier with Parthia and in numerous other areas. As a matter of fact, we will probably see the USA split into several sections before too long if things keep going the way they have been going. Just look at how Diocleation split the Roman Empire in two...
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