@NormalDudeWithaNormalLife but intrestinglly enough, would change the world if it were to go big. And yes wars do play a role in changing history as usual.
The reason why the countries around the world are what they are today is due to that of a single event that happened in 1914 which was a successful assassination attempt. And if that never happened, the world would've never been the world we know today.
Also, wars lead us to invent technologies never before, such as tanks in WW1, and radio in WW2, so if WW3 were to happen, new technologies would come in the war which would profoundly change warfare or human society.
Sucks that wars exist, but they exist for a reason, peace sometimes leads to nothing, so once so, we may just go to war with each other for some other reasons. Peace leads to war and war leads to peace and that'll be one of the only things humanity would never escape.