Or you could argue that the current climate of world peace was brought on by multiple currents including: 1- An acceleration of technology development that changed the sharing of resources to go from zero sum to a positive sum situation. 2- That nuclear weapons and other WMD have created a MAD situation, guaranteeing only minor skirmishes by super powers. 3- A variety of other factors including the integration of global supply chains, women's voting rights, etc.

But please, don't let these factors get in the way of your narrative of American exceptionalism.