| Answer | Crossword Clue |
|---|---|
| DST | 48 U.S. states observe it: Abbr. |
| ONTARIO | It borders five U.S. states |
| CST | Setting for 10 U.S. states: Abbr. |
| WWI | The U.S. joined it in 1917: Abbr. |
| EDT | Tennis's U.S. Open is played on it: Abbr. |
| EDT | The U.S. Open is played on it: Abbr. |
