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There are so many possible scenarios that discussions of this nature are going to bounce all over the place. Big difference between Islamic terrorism vs war with Russia or China vs internal politically motivated civil war vs internal collapse due to economics. Just looking at war with external parties (Jihadis, Russia or China), there are big differences between cyberwar, biowar, nukes, and conventional war (soldiers, tanks, bombs etc). Of course it also possible to have more than just one scenario happening simultaneously or sequentially.