WWI Propaganda is known for influencing the involvement in war, a very big, and known WWI Propaganda was the Uncle Sam poster. It was used to shape opinions, and it was also to encourage people. It was also used to keep the nation's moral up, and to make people hate the enemy. Another thing it was used for would be to influence, but make it seem like the people were making a choice.
Some great examples of WWI propaganda is Uncle Sam which was used to encourage people to join the U.S. Army. The poster