After World War I, aka the Great War, it was up to the three main Allied powers to develop a treaty that would officially end this war. When creating this treaty, France and Britain both wanted revenge on Germany. The reason why both of these countries wanted revenge was due to the amount of infrastructure damage that was done to their country and the amount of soldiers killed during this war.
America, on the other hand, did not seek out as much vengeance. This is because the US had not been involved in World War I as long as Britain and France. Along with this, none of the actual fighting took place on American soil. This means that the US suffered zero damage to their infrastructure.