| A | B |
| Nationalism | Strong loyalty to your country and culture |
| Alliances | Agreement between countries that ties their interest together |
| Archduke Ferdinand | Heir to the throne of Austria-Hungary |
| Central Powers | Austria-Hungary, Germany, and their allies |
| Allied Powers | Serbia, Russia, France, Britain, and others |
| Allies | Members of an alliance |
| Great War | Later called World War I, 1914-1918 |
| Armistice | An agreement to stop fighting |
| Treaty of Versailles | Treaty that ended the Great War |
| League of Nations | International council to prevent future wars |
| Lusitania | Passenger ship sunk by German submarine |