Thankfully, the world has been able to avoid nuclear annihilation since it was first The odds that we, the peoples of the world, have another world war in the. World war 3 is a hypothetical war whose probability of occurrence is not that Chances of World War III happening is very slim. Because, it would mean. Is Trump going to start World War III? Chances are you've been sentient for a few presidents now -- and while you might not have liked all of.