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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.

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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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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 against the Central Powers of Germany, Austria-Hungary, the Ottoman Empire, Bulgaria, and their colonies during the First World War.

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The Central Powers, also known as the Central Empires, was one of the two main coalitions that fought World War I. It consisted of Germany, Austria-Hungary, the Ottoman Empire and Bulgaria; hence it is also known as the Quadruple Alliance.

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Archduke Franz Ferdinand Carl Ludwig Joseph Maria of Austria (18 December 1863 – 28 June 1914) was the heir presumptive to the throne of Austria-Hungary.

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During World War I, 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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Trench warfare, combat in which armies attack, counterattack, and defend from relatively permanent systems of trenches dug into the ground.

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RMS Lusitania was a British ocean liner that was sunk on 7 May 1915 by a German U-boat 11 miles off the southern coast of Ireland, killing 1,198 passengers and crew. The sinking occurred about two years before the United States declaration of war on Germany.

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The Zimmermann Telegram (or Zimmermann Note or Zimmerman Cable) 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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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 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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The convoy—a group of merchantmen or troopships traveling together with a naval escort—was revived during World War I, after having been discarded at the start of the Age of Steam.

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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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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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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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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.

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