Answer:
Propaganda is information, especially of a biased or misleading nature, used to promote or publicize a particular political cause or point of view.
During World War I, propaganda campaigns were used to focus on the patriotic duty of all citizens to back the war effort in order to defeat the enemy. During the years of the Great War, 1914-1919, information and entertainment were communicated through magazines, newspapers, sheet music, silent movies, phonographs, books and posters. Posters were the main form of propaganda during World War I, and the posters showed patriotic slogans and symbols to inspire citizens to serve their country by enlisting in the military.