The immediate spark of the war was the assassination of this Archduke of Austria-Hungary in Sarajevo.
Franz Ferdinand
This British passenger liner was sunk by a German U-boat in 1915, killing 128 Americans and shifting public opinion against Germany.
Lusitania
This static and deadly style of fighting involved soldiers living in deep ditches separated by "No Man's Land."
Trench warfare
These were sold by the U.S. government to citizens to raise billions of dollars to pay for the war effort.
Liberty (War) Bonds
This was the name of President Woodrow Wilson’s idealistic plan for a fair and lasting world peace.
14 points
This acronym represents the five long-term causes of WWI: Militarism, Alliances, Nationalism, Imperialism, and Assassination.
MAIN
MANIA
In this intercepted telegram, Germany promised to help Mexico regain lost territory in the U.S. if Mexico joined the Central Powers
Zimmerman Telegram
This new chemical weapon caused blindness, skin blisters, and lung damage, forcing soldiers to carry protective masks at all times.
poisonous gas
This 1917 law required men to register for the draft to quickly increase the size of the U.S. military.
Selective Service Act
This international organization was created to provide a place where nations could talk out their differences rather than go to war.
The League of Nations
This term describes an intense pride in one's country or the desire for ethnic groups within empires to have their own independent nations
nationalism
President Woodrow Wilson asked Congress for a declaration of war to make the world "safe" for this.
democracy
This 1918 battle was the largest offensive in U.S. military history and eventually broke the German spirit and lines.
Battle of Argonne Forest
These two laws were passed to silence war critics and made it a crime to criticize the government or interfere with the war effort
Espionage and Sedition Acts
This final peace treaty forced Germany to accept "war guilt," pay billions in reparations, and lose its colonies.
The Treaty of Versailles
This system meant that a local conflict between two nations could quickly escalate into a global war involving all major powers.
Alliance System
This was the official German policy of sinking any vessel in the Atlantic without warning, which ultimately drew the U.S. into the war.
Unrestricted Submarine Warfare
He was the commander of the American Expeditionary Forces (AEF) who transformed inexperienced troops into an effective military force.
General John J. Pershing
This demographic shift saw millions of African Americans move from the rural South to Northern cities for industrial war jobs.
The Great Migration
This powerful Senator led the opposition against the Treaty of Versailles because he feared the League of Nations would pull the U.S. into future wars.
Henry Cabot Lodge
This cause of the war involves the aggressive build-up of armed forces and the glorification of military might
militarism
Before 1917, the United States attempted to follow this policy of staying out of foreign conflicts and not taking sides.
Neutrality
This American soldier became a hero at the Battle of Argonne Forest after single-handedly killing 25 Germans and capturing 132 others.
Alvin York
In this landmark Supreme Court case, the court ruled that free speech could be limited if it created a "clear and present danger.
Schenck v. United States
One of Wilson’s key points was this principle, which argued that ethnic groups should have the right to form their own nations and governments.
Self-determination