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An agreement made by opposing sides in a war to stop fighting for a certain time; a truce.

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Around 16,000 men refused to take up arms or fight during the First World War for any number of religious, moral, ethical or political reasons. They were known as conscientious objectors.

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United States Corporal Alvin C. York reportedly kills over 20 German soldiers and captures an additional 132 at the head of a small detachment in the Argonne Forest near the Meuse River in France. The exploits later earned York the Medal of Honor.

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was a senior United States Army officer. He served most famously as the commander of the American Expeditionary Forces (AEF) on the Western Front during World War I, from 1917 to 1918.

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Commanded by General John Pershing, were the armed forces that the United States sent to Europe during World War I. Because the American troops needed training, very few made it over to Europe before 1918.

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A group of ships sailing together for protection, was designed to help protect cargo in passenger ships during the First and Second World War. The system was created out of desperation.

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Congress passed the Selective Service Act, which Wilson signed into law on May 18, 1917. The act required all men in the U.S. between the ages of 21 and 30 to register for military service.

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Was an American fighter pilot in World War I and a Medal of Honor recipient. With 26 aerial victories, he was the most successful and most decorated United States flying ace of the war.

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Trench warfare is a type of combat in which the opposing sides attack, counterattack, and defend from relatively permanent systems of trenches dug into the ground.

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A German U-boat torpedoed the British-owned steamship Lusitania, killing 1,195 people including 128 Americans, on May 7, 1915. The disaster set off a chain of events that led to the U.S. entering World War I.

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Militarism denoted a rise in military expenditure, an increase in military and naval forces, more influence of the military men upon the policies of the civilian government, and a preference for force as a solution to problems. Militarism was one of the main causes of the First World War.

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The Zimmerman Telegram was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico if the United States entered World War I against Germany.

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he Allies described the wartime military alliance of Germany, Austria-Hungary, Bulgaria and the Ottoman Empire as the 'Central Powers'.

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a person, group, or nation that is associated with another or others for some common cause or purpose: Canada and the United States were allies in World War II.

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The narrow, muddy, treeless stretch of land, characterized by numerous shell holes, that separated German and Allied trenches during the First World War.

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Heir apparent to the thrones of Austria and Hungary whose assassination precipitated the outbreak of World War I

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Nationalism is an intense form of patriotism or loyalty to one's country. Nationalists exaggerate the importance or virtues of their home country, placing its interests above those of other nations.