Terms
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100

disloyalty towards one's country, especially betrayal by plotting against it or aiding enemies of it

treason

100

The commander of the American Expeditionary Force during WWI

John J. Pershing

100

the alliance between Germany, Austria-Hungary, and Italy

Triple Alliance

100

a German submarine

U-boat

200

to prevent loss or waste

conserve

200

The commander of the Allied troops

Ferdinand Foch

200

the alliance between Britain, France and Russia

Triple Entente

200

A German submarine sunk this passenger ship. 

Lusitania

300

an attack

offensive

300

Serbia was responsible for the shooting of this Archduke

Francis Ferdinand

300

the alliance between Germany, Austria-Hungary, at the beginning of World War I, later joined by the Ottoman Empire and Bulgaria

Central Powers
300

The U.S. used this type of system to acquire soldiers for WWI. 

Draft system

400

an explosive that travels underwater to its target 

torpedo

400

He became the head of the Communist Party and signed a peace treaty with Germany

Vladimir Lenin

400

the alliance between Britain, France, Russia, Serbia, and other nations during World War I

Allies

400

The line of trenches between Belgium and France where fighting occurred during WWI

Western Front

500

strong patriotic feelings for one's own country

nationalism

500

He sent a telegram to Mexico asking them to fight for Germany if the U.S. entered the war. 

Arthur Zimmermann 

500

The U.S. joined this alliance when entering WWI 

Allies

500

The largest sea battle of World War I fought in the North Sea

Battle of Jutland