why cant everyone in the world just declare peace so that theres no war
utopia. in any case, people who have disagreements and have fragile egos will still fight with each other
World peace can't be achieved because first world countries can't let 2nd and 3rd world countries stabilizes because if they did they wouldn't be able to steal their resources or in the case of some European countries buy it from them for very cheap
It would be possible in a world free of religion, but when since main religion are supremacist, thats make things harder