- Allied Powers: Group of countries that included UK, France, and Russia. Also includes the United States when they enter the war
- Bunkers: Underground protection from enemy fire and for a place to sleep. They were connected to the trench system
- Central Powers: Group of countries that included Austria-Hungary, Italy, and Germany
- David Lloyd George: A British ruler that tried to prevent Germany from sinking British ships.
- Francis Ferdinand: His Death Caused WWI
- Gavrillo Princip: Assassinated Ferdinand
- Georges Clemenceaus: a young French politician that railed the French people to defend their homeland
- Kaiser William II: German Emperor that offered support to Austria-Hungary to defeat the Black Hand
- Lusitania: British liner torpedoed by a German submarine in May 1915
- Marne: a battle that ended Germany’s hope for a quick victory on the Western Front
- Militarism: Glorification of the military
- No Man's Land: the land in between the trenches were many soliders died because of them going over the top. Many of them would die before they even got close to the enemy’s trench.
- Orlando: He was the Italian Prime Minister at the end of World War I and was one of the 3 leaders that were at the conference of Paris. He joined sides with allies during the war.
- Over the top: a military term used when soldiers had to leave their trench and go into the No Man’s Land in order to attack the enemy trench
- Propaganda War: spreading of ideas to promote a cause or damage an opposing cause
- Sclieffen Plan: a plan designed for Germany to avoid a two front war by invading Belgium to get to France. This however made Britain mad and declared war against Germany
- Somme: British offensive to break german lines. No gain of terroitory
- Sussex Pledge: a agreement between the United States and Germany that the unrestricted submarine policy would be altered for safety.
- The Black Hand: The Terrorist group that organized the assassination that was carried out by Gavrilo Princip. Gavrilo Princip was a member of this group. The assassination sparked the World War I
- Total War: Channeling of a nations entire resources into a war effort
- Trench Warfare: type of warfare used in WWI
- Verdun: A battle that tries to break the stalemate by launching massive attack on French
- Woodrow Wilson: Sent america to war with Germany
- Zimmerman Note: a note that was intercepted by the British from a German foreign minister seeking Mexico’s support against the United States in exchange for helping Mexico recapture their lost territory (NM, TX, AZ)