Random theories I haven't thought through yet

Of fact-checked for that matter. Nonetheless, here are two bigthink ideas that have occurred to me recently:

• With the notable exception of Imperial Japan, America hasn't gone to war with any country that likes itself in the past 100 years. While I don't usually go for theories involving Constructivism, all of the countries we've had conflict with, Nazi Germany, North Vietnam and North Korea, et al, are all fighting to some degree for national pride. This is why I'm not particularly worried about Iran, because the Iranians seem to like being Iranian.
• The rise of dominant militaries can be summarized as discipline vs identity. By this I mean that the troops can be effective via skillful execution of a central plan, or simply by being themselves. The Romans were a good example of a disciplined group. They were able to carry out the will of their commanders due to training and tight organization. On the other hand, the Mongols required little central direction and usually just had to be their fearsome selves to successfully win wars. Most of the major conflicts through history can be characterized as a clash between these two tactics.