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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 conscientious objector is one who is opposed to serving in the armed forces and/or bearing arms on the grounds of moral or religious principles.

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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, gathered 35 machine guns, killing at least 25 enemy soldiers and capturing 132 prisoners.

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General of the Armies John Joseph Pershing GCB, nicknamed "Black Jack", was a senior United States Army officer. He served most famously as the commander of the American Expeditionary Forces on the Western Front during World War I, from 1917 to 1918.

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The American Expeditionary Forces (AEF), 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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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. The modern convoy system is most associated with the First World War, but it has a much longer pedigree in history.

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The Selective Service Act of 1917 or Selective Draft Act 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 a Medal of Honor recipient. With 26 aerial victories, he was the United States' most successful fighter ace in the war and is considered to have received the most awards for valor by an American during the war.

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The Zimmerman Note 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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The Lusitania was a British passenger ship that was owned by the Cunard Line and was first launched in 1906. Built for the transatlantic passenger trade, it was luxurious and noted for its speed. During World War I the Lusitania was sunk by a German torpedo, resulting in great loss of life.

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Trench warfare was a defensive military tactic used extensively by both sides, allowing soldiers some protection from enemy fire but also hindering troops from readily advancing and thus prolonging the war. Trench warfare was the major combat tactic in France and Belgium.

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No Man's Land was both an actual and a metaphorical space. It separated the front lines of the opposing armies and was perhaps the only location where enemy troops could meet without hostility.

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Archduke Franz Ferdinand Carl Ludwig Joseph Maria of Austria was the heir presumptive to the throne of Austria-Hungary.

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The Central Powers was the name given to Germany, Austria-Hungary, and their supporters, during World War I.

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The Allies of World War I or Entente Powers were a coalition of countries led by France, Britain, Russia, Italy, Japan, and the United States.

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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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Identification with one's own nation and support for its interests, especially to the exclusion or detriment of the interests of other nations.