This is very naive. The reason the "first world" is peaceful is only because of two things - nukes and American hegemony. You need a hegemon for peace. Are you

This is very naive. The reason the "first world" is peaceful is only because of two things - nukes and American hegemony. You need a hegemon for peace. Are you familiar with Japanese history? It was not until unification that the wars stopped. Finally there was a hegemon who brought peace by acting as the ultimate arbiter of power. The same thing happened to the "first world". A dominant hegemon emerged in the form of the US. This hegemon set the rules and made it so nobody needed to worry about their neighbors. A hegemon is the only way you can get peace in an environment that is otherwise anarchic.