The US government seeks conflict to maintain and improve the US economy. It's just another Keynesian public works project, based on the false assumption that prosperity is a result of war.
I agree that the US use conflict as an economic tool. But it's wrong that "prosperity is a result of war" is an entirely false assumption - at least it's often true for the winner, that's why the US keeps doing it.
I don't know if QE is somehow coordinated between nations, but it's likely that the US will try to get their "allies" (servants) to shoulder at least a part of the expense of fighting the enemy (Russia/China).