to prevent loss or waste

an explosive that travels underwater to its target

an attack

strong patriotic feelings for one's own country

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

the alliance between Britain, France, and Russia

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

the alliance between Germany, Austria-Hungary, and Italy

For the first time since the Civil War the United States government use a national system to acquire soldiers for World War I.

The line of trenches between Belgium and France where fighting occurred during World War I became known as the eastern front.

A German submarine was called a U-boat.

Arthur Zimmermann sent a telegram to Mexico asking them to fight for Germany if the United States entered the war.

A German submarine sank the Lusitania, a cargo ship.

During World War I Russia was changing politically.

Who was the commander of the American Expeditionary Force (AEF) during World War I?

Who was the commander of the Allied troops during World War I?

What country was responsible for the shooting of Archduke Francis Ferdinand?

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

What was the largest sea battle of World War I that was fought in the North Sea?