WWI Keep Him Free Poster

World War I began as a conflict between the Alllies (France, the United Kingdom, and Russia) and the Central Powers (Germany and Austria-Hungary). The assassination of Archduke Francis Ferdinand, the heir to the throne of Austria-Hungary and his wife Sophie ignited the war in 1914. Italy joined the Allies in 1915, followed by the United States in 1917. The poster was a major tool for broad dissemination of information during the war. Countries on both sides of the conflict distributed posters widely to garner support, urge action, and boost morale. During World War II, a larger quantity of posters were printed, but they were no longer the primary source of information. By that time, posters shared their audience with radio and film.