| Answer | Crossword Clue |
|---|---|
| HOWARD | 20th Cen. American dramatist. |
| USSR | 20th-cen. superpower |
| WWI | 20th cen. conflict |
| MCMI | 20th-cen. start. |
| WWII | 20th-cen. calamity |
| WWI | Early 20th-cen. conflict |
| WWI | Huge 20th-cen. conflict |
| WWI | Major 20th-cen. conflict |
| WWI | Big 20th-cen. conflict |
| WWI | 20th-cen. global conflict |
| ILGWU | 20th-cen. largely female labor org. |
| MOMA | Where 20th-cen. painters hang out? |
| ALBERTEINSTEIN | 20th cen. pioneer in mathematical theory. |
| PREWWI | Before a big early 20th-cen. conflict |
| SIGMUNDFREUD | 20th cen. pioneer in study of the mind. |
