During an extended period of the depression in USA (between 1935-1942), the US federal government supported artists by commissioning artwork for non-federal places and activities. Early on in the project, posters were painted by hand, each individually created. Later on, they were printed with silk screen.
According to the US library of congress, “over two million posters were printed from thirty-five thousand designs. Today, only about two thousand of the posters produced by all the poster divisions are known to exist.” This initiative expanded the techniques and methods for screen printing.
Some of the posters were not official, never meant for public displays; examples of artists being artistic, sarcastic and humorous.