People were tired after WWI.
And rightly so. Europe lost an entire generation to a meat grinder. One could argue they still havent fully recovered. Wilson dragged America into that carnage kicking and screaming.
Less than a generation later we were again embroiled in two horrific wars because we fell asleep at the switch.
L
Yes, France in particular was played out; after all, it happened on their turf. I enjoy reading Gertrude Stein who wrote marvelous memoirs of living in Paris and the countryside during the war. Somehow, she managed to have fun while living quietly as a Jew in Occupied France.