| A | B |
|---|
| Militarism | The policy of building up armed forces in aggressive preparedness for war. |
| Allies | The nations allied against the Central Powers of Europe during World War I. They were Russia, France, Great Britain, and the U.S. |
| Central powers | The group of nations-led by Germany, Austria-Hungary, and the Ottoman Empire-that opposed the allis in World War 1. |
| Archduke Franz Ferdinand | A nephew of Emperor Franz Joseph, he was heir to the Austrian throne. |
| No man's land | An unoccupied region between opposing armies. |
| Trench warfare | Military operations in which the opposing forces attack and counterattack from systems of fortified ditches rather than on an open battlefield. |
| Lusitania | British passenger ship that was sunk by a German U-boat in 1915. |
| Zimmermann note | A message sent in 1917 by the German foreign minister to the German ambassador in Mexico, proposing a German-Mexican alliance and promising to help Mexico region Texas, New Mexico, and Arizona if the U.S entered World War 1. |
| 9 | 9 |
| 10 | 10 |
