How did the government use propaganda to mobilize Americans to fight World War 2?

One of the chief ways Propaganda was used was through the use of pre-movie "war updates". Anytime a person went to the movies, they saw a brief clip of how the war effort was going in Europe and in Asia and encouraged them to "do their part." Posters were prevalent, featuring now-iconic characters such as Uncle Sam and Rosie the Riveter.