One of my profs in Uni said that it was difficult to find more than a few years in recorded history without active war.
I would argue there has fundamentally been change post WWII, and that is (1) the MAD doctrine--which limits active war--as well as (2) the push towards borderless states / globalization--i.e. even though Sweden is defined as sovereign, the institutions of the world dictate that if it doesn't do what the US says--whether that be torturing suspects at the US's demands[1] or taking down websites--they don't have much of a choice.
During WWII the drive for technology was extreme because of the threat of being conquered. And throughout all of human history our ancestors lived with this threat. We don't really have this threat anymore.
There is a Keynes quote, where he put it, "it is better for man to toil over their bank accounts than each other." Our wars are kind of laughably phony, and the real battle is over numbers in bank accounts--which seems to be the only reason we go to war now anyways (for all parties involved).
We do have a new kind of religion we are all following in a way in the sense that money and dieties are only endowed with whatever faith or meaning we give them. And in makes sense to do it because they've set it up so the rewards and punishments are as such.
So in a way I think this can be seen as the world'd largest and most successful social engineering project in history. I think it is a fundamental change in the nature of our masters.
1-https://www.hrw.org/news/2005/05/19/sweden-violated-torture-...