Presidential Proclamation 1364 of April 6, 1917, by President Woodrow Wilson declaring war against Germany. 04/06/1917 a declaration of war against Germany during his address to Congress on April 2, 1917. Congress complied, leading to this formal declaration of war, and bringing the United States fully into World War I.
Ernest Hemingway at age 19, photo taken in Milan, Italy, 1918. After high school Hemingway enlisted in WWI. He left for the Italian front in 1918. He served in a volunteer ambulance unit. He was wounded and decorated by the Italian government with the Italian Silver Medal of Bravery. During WWII, he was at the Normandy landing, the liberation of Paris and several other key moments as a war correspondent.