The document discusses the use of propaganda by various powers during World War I and World War II. It describes how the Nazis effectively used propaganda to change public opinion in Germany and build support for the Nazi party and its policies. Adolf Hitler and Joseph Goebbels recognized propaganda's power to not only inform but influence people's beliefs. The Nazis used propaganda through posters, films, and speeches to promote ideas of German solidarity, racial purity, and preparation for war. Leni Riefenstahl's famous Nazi propaganda film "Triumph of the Will" is discussed as an example of glorifying the Nazi party and Hitler's vision for Germany.