The most prevalent propaganda media form was posters.
During World War 1 and World War II, but mostly in WWII, the United States government designed propaganda campaigns to invite American citizens to support the war effort. It mostly used posters to communicate with people and ask them their support. It was an effective way to share political ideas and spread its version of the war.
Emperor Constantine I converted to Christianity. One major step he took to increase tolerance of Christians was the Edict of Milan, which declared religious tolerance for Christians within the Roman Empire.
