The action of attacking another person or country.

The crown prince of the Austro-Hungarian Empire. He and his wife were killed by a Serbian in 1914. This act set the stage for World War I.

An agreed upon time for fighting to stop. It is a truce. It can be temporary or permanent.

The period of Christmas Eve and Christmas Day in 1914 when soldiers from both sides stopped fighting. In many places, soldiers met in No Man’s Land, exchanged small gifts and played games.

A form of government where the government owns everything in the name of the people. Russia replaced their monarchy with Communism.

A form of government where all representatives are elected by the people.

To increase or become more. In wartime, it usually means that there are more battles.

A speech by President Wilson. In it he outlines his fourteen points to stop The Great War and prevent future wars in Europe.

Another name for World War I.

A virus that spreads easily from one person to another. Sometimes called flu.