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

Who was the commander of the Allied troops?

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?

For the first time since the Civil War the United States government used 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 western front.

A German submarine was called a T-boat.