During World War II, propaganda posters in the United States were usually moved around town for a walk or work, a trip to the store, in a newspaper or magazine, and at any other time.
Posters were not the only form of propaganda used by the US government. They also employed Hollywood, radio programs and advertising, cartoons, music and other forms of media.
However, posters were more common than other methods of promotion. They were built on a large scale and spread over a large area, whereas a movie could only be seen by theatre-goers.
Another advantage was that a person's exposure to the poster could be longer than a radio programme. One could only listen to a radio campaign during the purchased time slot, but a poster would be on a wall until elements or people took it down, or a new poster was pasted on it.