PJB PJB:
Can anyone think of a time after that the world did not have some sort of conflict?
The world was rarely peaceful prior to WW1 either. WW1 really only put an end to the nonsensical belief among the colonial powers and the US that war was some sort of grand adventure for our "brave and glorious lads so far away" instead of the murderous stupidity that it is and always has been. Decades-long periods of relative peace between the large powers really didn't happen until after the proliferation of nuclear weapons during the Cold War. And for people yapping and panicking over current events in Gaza, Syria, Iraq, and Ukraine, these events are practically tiny in comparison to the instability and violence that happened during the Korean War, the American war in Vietnam & Cambodia, and the Soviet war in Afghanistan.
One can never assume that things can't get worse. In reality though, despite what the media puts across and what too many of the gullible want to believe, this is actually one of the more peaceful periods in recorded history. Look past the media and see how much of the planet is stable, peaceful, and prosperous, and it is credibly arguable that war & violence is at it's lowest level in practically all of our lifetimes.