Not a moderator, but welcome to the dark side.
I don't think the general increase in peace (yes, the world is more peaceful now than it's been in recorded history, and has been for some time) is necessarily a consequence of a fundamental evolution in human nature, or a consequence of US hegemony. There are a number of more pragmatic factors involved, for example:
Nuclear weapons and mutual assured destruction raised the risks of great power conflict to a hitherto unknown level. That's why the Cold War was fought by proxy: nobody had evolved beyond fighting, the probable consequences of direct conflict had simply become unacceptable.
The dissolution of imperial spheres of trade and the emergence of relatively free trade reduced a major incentive to conflict. Emerging economic players no longer need to conquer territory to gain access to resources and markets.
Commercial interdependence has reduced (not eliminated, but reduced) the incentive to fight.
There are more, of course, but overall I don't think we've become more peaceful as a race. We've just given ourselves fewer good reasons to fight and more good reasons not to.
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