How did the United States government mobilize for WWI By Alex DeLuca Apr 6, 1916 the U.S. joined WWI Period: May 15, 1916 to May 15, 1919 U.S. dept went from $1.2 billion to $25.5 billion Period: May 15, 1916 to May 15, 1919 Union membership increased by about 60 percent Period: May 15, 1916 to May 15, 1919 Influenza epidemic rises, killing 675,000 Americans Period: May 15, 1916 to May 15, 1919 women take many of the jobs once owned by men Period: May 15, 1916 to May 15, 1919 George Creel established propaganda posters to influence citizens Jul 6, 1916 the famous “I want you” poster is introduced Feb 15, 1917 the War Revenue Act was passed Established higher taxes Feb 15, 1918 National War Labor Board was created judged disputes between workers and management Feb 15, 1919 Eighteenth Amendment was passed prohibits the production of alcohol