As far as I know these major historical events come in cycles of 180 years, during which there is a repeating ebb and flow. During these periods the parasitic elites or shepherds/guardians of humanity (it depends on perspective) have to make sure to reshuffle and cull the herd before the end of the cycle because otherwise it would cannibalise and end itself. The latter not being a negative prospect if you look at it with a Gnostic lens. However, the elites don't want this to happen because they'd rather rule in hell than serve in heaven...
Right now we are in the third 30 years war cycle within the grater one. The first one was the original 30 years war that almost killed Germany, the second one was WW1 1915 until WW2 1945 (30 years) and this one we’re in now began in 2014 with the coup in Ukraine and will end in 2045 plus minus 3 years. The goal is to sustain the system until then because it guarantees population replacement. They are giving boomers and Xers an easy time while making Millennials and *****mers suffer until then. Because Boomers & Xers have all the money and run all the infrastructure while Millennials and *****mers could potentially revolt, thus most probably will be sent to a meatgrinder with some bullshit pretext before the cycle ends and the next starts. By then the older generations will be gone and the rest would have been reduced by war, famine and pestilence thus ensuring the ruling elites will have the least possible amount of competition when the game is reset.