| A | B |
| Industrial Revolution | Period of growth in manufacturinf and factories in Europe in 1700's and 1800's, caused many people to move to cities, demanded greater natural resources |
| World War I | Started in 1914, between Allies and Central Powers, deadliest battle in history at the time, ended with Treaty of Versailles in 1919 |
| World War II | Deadliest war in history, between Allies and Axis or Central Powers, included Holocaust, D-Day, Pearl Harbor, and the first use of atomic weapons |
| Cold War | Competition between U.S. and U.S.S.R. for power and influence around the world, lasted for 50 years |
| Great Depression | worldwide economic slowdown that contributed to World War II |
| Space Race | Competition between U.S. and U.S.S.R. to put satellites into space and a man on the moon |
| Arms Race | Buildup of weapons between U.S. and U.S.S.R. during the Cold War |
| German Reunification | Bringing back together East Germany and West Germany into one country after being split apart at the end of World War II |
| Treaty of Versailles | Treaty to end World War I, punished Germany, one of the causes of World War II |
| Berlin Airlift | U.S. effort to bring food and aid to people of East Berlin who were cut off from supplies by Soviet troops |
| Russian Revolution | Russian civil war that resulted in Lenin and communists taking power in 1917 |
| Holocaust | Mass murder of Jews by Hitler and Nazis during World War II |
| Colonization | Control of distance lands in order to exploit them for their natural resources |
| Annexation of Austria | First event of World War II |
| Assassination of Archduke | Led to the start of World War I |
| D-Day | Largest military event in history |
| Normandy, France | Site of D-Day |
| Operation Overlord | Another name for D-Day |
| Belgium | Site of the battle of the Bulge during WW II |
| Radar | New technology that saved England from the Germans |
| Antibiotics | New medicine that saved millions of soldiers from dying |
| Franz Ferdinand | Archduke of Austria; assassinated at start of WWI |
| Vladimir Lenin | Led Russian Revolution; started communism in Soviet union |
| Joseph Stalin | Replaced Lenin in 1929 and ruled through World War II; ruthless dictator |
| Adolph Hitler | Chancellor of germany and leader of the Nazi party |
| Franklin D. Roosevelt | President of the U.S. during World War II |
| Winston Churchill | Prime Minister of England during World War II |
| Berlin Wall | Built in 1960s to keep East germans from leaving; torn down in 1991 |
| Benito Mussolini | Leader of Italy during World War II |
| Central Powers | Germany and Italy |
| Allies or Allied Powers | England, France, U.S., and Soviet Union |
| V-E Day | Victory in Europe Day; the day that Germany surrendered |