Gallica is the online library of the French National Library, with over 6 million documents online. Most finding aids are in French, so if you don't know much/any French, it will be best to search it for the French term for "interwar," L'entre-deux-guerres, names of places, people, individual years, or regimes (e.g., Vichy).
Searchable full-image of the Chicago Defender (1909-2010), Chicago Tribune (1849-1999), Los Angeles Times (1881-2000), St. Louis Post-Dispatch (1874-2003), New York Times (1851-2020), Wall Street Journal (1889-2012), Washington Post (1877-2007), Kansas City Call (1919-2010), Pittsburgh Courier (1911-2010), and the St. Louis American (1949-2010).
Provides access to scholarly journals in the arts and sciences. Contains a digital library of images, previously known as ARTStor, in the areas of art, architecture, the humanities, and social sciences with a set of tools to view, present, and manage images.