This would be a blessing. I think we can trace most of our problems back to the end of the cold war. If we have some common thing to fight against we stop fighting each other (see Watchmen- ironically though it was about ending the cold war but a level down it works)
More realistic is a 1984 style "continuous but meaningless war" that lets the various parties pursue their ideological aims without fear of revolt from inside. Though I have no idea how to prepare for this