Spanish Civil War By 18ajohnsonSTEM Jan 10, 1920 League of Nations Formed Jul 18, 1936 Spanish Civil War breaks out Nov 4, 1936 Neutrality Act of 1936 Feb 14, 1937 League of Nations bans International Brigades from participation in the War Apr 1, 1939 War Declared Over Oct 21, 1940 Ernest Hemingway published “For Whom The Bell Tolls”