| A | B |
|---|
| Militarism | A policy of building up a nation's military to prepare for war. |
| Mobilize | To prepare a nation's military forces for war. |
| Trench Warfare | Warfare used widely in World War I in which soldiers of opposite sides shot at each other from a system of ditches separated by a "no man's land." |
| Armistice | An agreement to stop fighting. The armistice of World War I was signed on the eleventh hour of the eleventh day of the eleventh month in 1918. |
| Isolationism | The desire of a nation to stay out of international affairs. |
| Submarine Warfare | German attacks on shipping by submarines. |
| Zimmerman Telegram | A telegram sent by the Germans to urge the Mexicans to attack the United States. In return for the winning back of lands in the southwestern U. S. |
| Allied Powers | The nations of Great Britain, France, Russia, Belgium, and Serbia that were later joined by the United States to fight against the Central Powers in World War I. |
| Central Powers | The nations of Germany, Austria-Hungary, Bulgaria, and the Ottoman Empire that fought against the Allied Powers in World War I. |
| Western Front | A battle line that extended across Belgium and France, containing trenches, that was a main battlefront of World War I. |
| League of Nations | Contained in Woodrow Wilson's plan for peace (The Fourteen Points), this was an organization of nations formed to maintain peace. |
| Woodrow Wilson | President of the U. S. during World War I. |
