If you owned a tehnology high enogh and take out all armys in the world (friend and enemy), to prevent them from fighting each other, then its posible.
In other words, 2 armys are fighting each other, you wipe out bouth of them, morale of bouth armys goes down and their public support fails. Without war founding (or being to expensive to replace losses), its not worth any more to wage war.
1.st person who advances nano-tehnology to a lvl, where you dont need living soldiers and units can be created from a surronding mass, will win and unite the world.
When will this age happen, no1 knows.
Or that:
(massive mind control, people wouldnt realize they are controled and keep on with their lives)