Americans in Paris, 1860–1900 – The Metropolitan Museum of Art https://www.metmuseum.org/essays/americans-in-paris-1860-1900
As Henry James remarked in 1887: “It sounds like a paradox, but it is a very simple truth, that when to-day we look for ‘American art’ we find it mainly in Paris.”
Many American artists stayed together, and enclaves of them developed on the Left Bank