Can'T compute - to many options, but each option described with too little detailed charactericstic concerning why to call it "virulent". Generally said, the majority of empires on that list qualifies for that description.
An empire that does not push to the "outside" (inner pressure) seems to stagnate and finally fall, since there is always outside powers (counter pressure) that work against it. seen that way, an empire cannot afford not to press to the oputside and react to challenges at it'S border perimeter. It's a need deriving from a self-dynamic that has little to do with willing intentions, and plans.
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