Prelude to War (1942), the first of Frank Capra's Why We Fight film series (1942–45), urged Americans to remember the date of the Japanese invasion of Manchuria, September 18, 1931, "as well as we remember December 7th, 1941, for on that date in 1931, the war we are now fighting began".
Prelude to War, den første i Frank Capra's Why We Fight filmserie, opfordrede amerikanerne til at huske datoen for den japanske invasion af Manchuriet, 18. september 1931, "ligesom vi husker 7. december 1941, for på den dag i 1931 begyndte den krig vi nu udkæmper."