Military

Prior to the outbreak of World War I, military recruitment in the US was conducted primarily by individual states. Upon entering the war, however, the federal government took on an increased role. Between 1915 and 1918, 42% of all army recruitment posters were themed primarily by patriotism. And though other themes - such as adventure and greater social status - would play an increased role during World War II recruitment, appeals to serve one’s country remained the dominant selling point. {Via Wikipedia}