| Term | Definition |
| Kaiser Wilhelm | Leader of Germany |
| Czar Nicholas II | leader of Russia before the revolution |
| Gavrilo Princip | Anarchist that assassinated Arch Duke Ferdinand |
| Archduke Franz Ferdinand | heir to the Austro-Hungarian Throne |
| King George V | cousin to the Czar and Kaiser |
| Black Hand | Terrorist group that assassinated Ferdinand |
| Eddie Rickenbacker | American "ace"; shot down 26 enemy planes |
| Manfred Von Richthofen | German "ace"; flew a red tri-plane |
| Sergent Alvin York | credited with capturing 120 germans; won medal of honor |
| Woodrow Wilson | wanted a peace among equals. |
| Vladimir Lenin | Led the revolt that overthew the Czar |
| Eugene Debs | Socialist; former candidate for Pres; jailed for speaking out against the gov't |