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An armistice is a formal agreement of warring parties to stop fighting. It is not necessarily the end of a war, as it may constitute only a cessation of hostilities while an attempt is made to negotiate a lasting peace. It is derived from the Latin arma, meaning "arms" and -stitium, meaning "a stopping".

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A conscientious objector is an "individual who has claimed the right to refuse to perform military service" on the grounds of freedom of thought, conscience, or religion. In some countries, conscientious objectors are assigned to an alternative civilian service as a substitute for conscription or military service.

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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, gathering 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 AEF was created to fill the need for troops in Europe, especially for the weary British and French troops who had been fighting since 1914. The AEF when they first began had a standing army of 127,500 officers and soldiers. By the end of the war, four million men have served in the Army.

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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 or Eddie Rickenbacker 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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The Zimmermann 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. With Germany's aid, Mexico would recover Texas, Arizona, and New Mexico.

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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 is a type of land warfare using occupied lines largely comprising military trenches, in which troops are well-protected from the enemy's small arms fire and are substantially sheltered from artillery

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Two classic examples of No Man's Land are the demilitarised zone between North and South Korea, and the UN buffer zone that stands between the Greek and Turkish-controlled territories in Cyprus - both born of conflicts that were never entirely resolved.

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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, also known as the Central Empires, was one of the two main coalitions that fought in World War I. It consisted of the German Empire, Austria-Hungary, the Ottoman Empire, and the Kingdom of Bulgaria and was also known as the Quadruple Alliance

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The Allies, formally referred to as the United Nations from 1942 were an international military coalition formed during the Second World War to oppose the Axis powers, led by Nazi Germany, Imperial Japan, and Fascist Italy. Its principal members by 1941 were the United Kingdom, United States, Soviet Union, and China.

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Militarism is the belief or the desire of a government or a people that a state should maintain a strong military capability and to use it aggressively to expand national interests and/or values.

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Nationalism is an idea and movement that holds that the nation should be congruent with the state. As a movement, nationalism tends to promote the interests of a particular nation, especially with the aim of gaining and maintaining the nation's sovereignty over its homeland to create a nation state.