How did the United States dehumanize Germany in World War I?

The United States was able to dehumanize Germany during World War I. Germany thought it would win this war, and when Germany lost many people couldn’t believe that they had been defeated. The Germans had spent much time, effort, and money to build up its military in order to gain colonies. Germany thought its military was the best in the world and would win any conflict in which it fought. Germany was convinced it would defeat the Allies before the United States would become a factor in the war. This is one reason why the Germans began to sink ships again without warning them, even though Germany knew this would bring the United States into the war on the side of the Allies.
During the war, the people of Germany suffered greatly. The German economy was based on trade, and a prolonged war impacted that trade significantly. As the war dragged on, there were shortages of basic products that people needed such as meat, bread, dairy products, and potatoes. This led to riots within Germany in 1916. The government took more control over the economy, and the army influenced economic policy.
When Germany was defeated, very harsh peace terms were forced upon Germany. Germany lost some land and was unable to have a military that could go on the offensive. Germany also had to pay heavy reparations to the Allies. These harsh terms were imposed on Germany even though the United States suggested to Germany that the peace treaty would be an easier one on Germany if Germany surrendered instead of fighting to the bitter end. The Germans felt that they were duped by this suggestion, which helped lead Adolf Hitler to later call for revenge.
After the war, conditions became very desperate in Germany. There was widespread unemployment, and inflation soared. Many Germans suffered greatly. This helped propel a man with extreme views to eventually take control in Germany. This man, Adolf Hitler, led Germany on a path the created much death, destruction, and devastation as a result of the eventual outbreak of World War II in 1939.
https://alphahistory.com/weimarrepublic/world-war-i/

https://www.firstworldwar.com/features/germanyduringww1.htm