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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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a person who for reasons of conscience objects to serving in the armed forces.

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Alvin Cullum York, also known as Sergeant York, was one of the most decorated United States Army soldiers of World War I. He received the Medal of Honor for leading an attack on a German machine gun nest, taking at least one machine gun, killing at least 25 enemy soldiers and capturing 132.

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General of the Armies John Joseph "Black Jack" Pershing was a senior United States Army officer. His most famous post was when he served as the commander of the American Expeditionary Forces on the Western Front in World War I, 1917–18.

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The American Expeditionary Forces was a formation of the United States Army on the Western Front of World War I. The AEF was established on July 5, 1917, in France under the command of Gen. John J. Pershing.

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Background to Naval Convoys. The convoy system, 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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The Selective Service Act of 1917 or Selective Draft Act(Pub.L. 65–12, 40 Stat. 76, enacted May 18, 1917) authorized the United States federal government to raise a national army for service in World War I through conscription.

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Edward Vernon Rickenbacker was an American fighter ace in World War I and Medal of Honor recipient. With 26 aerial victories, he was America's most successful fighter ace in the war. He was also considered to have received the most awards for valor by an American during the war.

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The Zimmermann Telegram (or Zimmermann Note orZimmerman Cable) was a secret diplomatic communication issued from the German Foreign Office in January 1917 that proposed a military alliance between Germany and Mexico in the event that the United States entered World War I against Germany, Mexico would recover Texas

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On May 7, 1915, less than a year after World War I (1914-18) erupted across Europe, a German U-boat torpedoed and sank the RMS Lusitania, a British ocean liner en route from New York to Liverpool, England.

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a type of combat in which opposing troops fight from trenches facing each other.

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disputed ground between the front lines or trenches of two opposing armies.

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Archduke Franz Ferdinand, Archduke of Austria-Este was a member of the imperial Habsburg dynasty, and from 1896 until his death the heir presumptive to the Austro-Hungarian throne.

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World War One is a conflict between the Central Powers and the Allies. The Central Powers (red) consist of Austria-Hungary, Germany, Bulgaria and the Ottoman Empire. Important allied powers (yellow) are Serbia, Russia, France, the United Kingdom, Italy, Belgium and the United States.

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The Allies included Britain, France, Russia, Italy and the United States. These countries fought against the Central Powers which included Germany, Austria-Hungary, Ottoman Empire and Bulgaria. Archduke Ferdinand, of Austria-Hungary, was assassinated by a Serb on June 28, 1914.

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the belief or desire of a government or people that a country should maintain a strong military capability and be prepared to use it aggressively to defend or promote national interests.

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an extreme form of this, especially marked by a feeling of superiority over other countries