| A | B |
| Nationalism | Sense of extreme pride or loyalty to a nation |
| Imperialism | Quest for colonial empires. |
| Allied Powers | France, Great Britain, Russia, Italy, United States |
| Central Powers | Germany, Austria-Hungary, Ottoman Empire (Turkey), Bulgeria |
| Triple Alliance | Military Alliance formed by Germany, Austria-Hungary and Italy before WWI |
| Trench Warfare | Opposing armies fighting from behind fixed fortifications |
| Treaty of Versailles | Agreement ending World War I |
| Triple Entente | Military alliance formed by Great Britain, France, and Russia before WWI |
| Lusitania | British passenger liner torpedoed by German U-Boat |
| Pan-Slavism | Bring together all Slavic peoples of central and eastern Europe |
| Archduke Ferdinand | Heir to the Austro-Hungarian Throne |
| Gavrilo Princip | Serbian nationalist who killed Archduke Ferdinand |
| Militarism | Glorification of armed strength by a nation |
| No-man's Land | Small strip of area between the trenches. |
| Alliances | Countries siding with other countries for military strength. |
| Zimmerman Note | Proposed alliance with Mexico to gain U.S. states: New Mexico, Texas, Arizona |
| April 1917 | The date that the United States enters World War I |
| 1914 | The year that the Great War started in Europe |
| Woodrow Wilson | President of U.S. during World War I, wrote "14 Points", & founded the League of Nations |
| Treaty of Brest-Litovsk | Russian Bolsheviks sign this with the Central Powers |
| Kaiser Wilhelm II | leader of Germany during World War I |
| Vladimir Lenin | leader of Bolshevik Revolution in Russia; he ended Russia's involvement in WWI |
| Reparations | payments for war damages |
| Nicholas II | leader of Russia during WWI: last tsar of Russia |
| U.S.S.R. | Union of Soviet Socialist Republics |
| White Army | led by Alexander Kerensky during Russian Civil War; opposed Communism |
| Red Army | supported the Bolsheviks (aka Communists) in Russian Civil War |
| Russian Civil War | "Reds" vs "Whites" |