This article lists a surprising number of American authors who had all found high levels of productivity in the city of Paris, both during the Great War and afterward:
"In Paris the American author seems to get the right perspective of his native land. Three thousand miles away he finds himself better able to interpret or criticize the land of the free. Permeated by the French atmosphere, he suddenly develops a huge interest in America, and this interest, in turn, expresses itself usually in the form of a novel."
- two from Amazon: