disloyalty towards one's country, especially betrayal by plotting against it or aiding enemies of it
treason
The commander of the American Expeditionary Force during WWI
John J. Pershing
the alliance between Germany, Austria-Hungary, and Italy
Triple Alliance
a German submarine
U-boat
to prevent loss or waste
conserve
The commander of the Allied troops
Ferdinand Foch
the alliance between Britain, France and Russia
Triple Entente
A German submarine sunk this passenger ship.
Lusitania
an attack
offensive
Serbia was responsible for the shooting of this Archduke
Francis Ferdinand
the alliance between Germany, Austria-Hungary, at the beginning of World War I, later joined by the Ottoman Empire and Bulgaria
The U.S. used this type of system to acquire soldiers for WWI.
Draft system
an explosive that travels underwater to its target
torpedo
He became the head of the Communist Party and signed a peace treaty with Germany
Vladimir Lenin
the alliance between Britain, France, Russia, Serbia, and other nations during World War I
Allies
The line of trenches between Belgium and France where fighting occurred during WWI
Western Front
strong patriotic feelings for one's own country
nationalism
He sent a telegram to Mexico asking them to fight for Germany if the U.S. entered the war.
Arthur Zimmermann
The U.S. joined this alliance when entering WWI
Allies
The largest sea battle of World War I fought in the North Sea
Battle of Jutland