| A | B |
| Archduke Ferdinand | killing of this person started WWI |
| Central Powers | Germany, Austria-Hungary, Turkey |
| Allied Powers | Great Britain, France, Italy, & U.S. |
| submarine | new underwater weapon |
| Marx | started the ideas of Communism |
| Lenin | signed a peace treaty with Germany |
| propaganda | ideas that helped build support for the war in U.S. |
| France & Belgium | western front |
| Russia | surrendered to Germany |
| Wilson | President who wanted to stay neutral |
| Germany | Treaty of Versailles blamed this country |
| communism | government owns all the businesses |
| trench | type of warfare that begain WWI |
| 1917 | U.S. joined WWI |
| 1914 | WWI started |
| Lusitania | British passenger hit by Germany |