| Term | Definition |
| Austria-Hungary | Growing empire that annexed Bosnia and Herzegovina; declares war on Serbia after assassination of Archduke Franz Ferdinand |
| Serbia | Southern Slavic nation; home to the Black Hand; Austria-Hungary declares war on first |
| Bosnia | Southern Slavic nation seeking independence; annexation by Austria-Hungary creates war in the Balkans; housed parade that killed Ferdinand |
| Herzegovina | Southern Slavic nation seeking independence |
| Triple Alliance | Austria-Hungary, Germany, Ottoman Empire, Italy |
| Triple Entente | England, France, Russia |
| Franco-Prussian War | Confict between France and Prussia that creates deep divdes in European nations; the beginning of the alliances |
| Ethnocentrism | Idea that a country's way of life or culture is better than others and should be spread around the world to other countries |
| Isolationism | Idea that a country should remain neutral and stay out of global entanglements |
| nationalism | Deep love and pride in your country or culture |
| Balkans | Bosnia, Herzegovina, Serbia |
| Franz Ferdinand | Heir to the throne of Austria-Hungary; assassinated in Sarajevo, Bosnia; spark that starts war in Europe |
| Gavrilo Princip | Slavic nationalist and member of the Black Hand, kills Archduke Franz Ferdinand and his wife |
| Ottoman Empire | Former great empire in Europe and Asia, as it crumbles Bosnia and Herzegovina seek independence |
| France | Humiliated by Germans in Franco-Prussian War; Member of Triple Entente; looking to regain status is Europe |
| Germany | Big Brother to and culturally similar to Austria-Hungary, writes a "blank check" of support if Austria-Hungary declares war on Serbia |
| Great Britain | Enters war after Germany invades Belgium, a neutral country |
| Russia | Big Brother to and culturally similar to Balkan nations; moblizes once Austria-Hungary declares war on Serbia, causes Germany to enter war |
| United States | Tries to remain neutral; country is divided about who to support because of its mixed cultures |
| Black Hand | Slavic Nationalist group that plans and executes the assassination of Archduke Franz Ferdinand |