| Answer | Crossword Clue |
|---|---|
| USSR | 20th C. superpower |
| USSR | 20th-cen. superpower |
| WWII | 20th-c. upheaval |
| USSR | 20th-c. nation |
| TAXPAYERSREVOLT | Late 20th C. uprising |
| BOXERREBELLION | Early 20th C. uprising |
| MCMI | Early 20th c. year |
| DADA | Early 20th C. art movement |
| PCS | Late 20th C. phenomena: abbr. |
| KLINE | 20th C. artist Franz Joseph |
| STS | 10th, 20th, 30th, etc., in N.Y.C. |
