| Answer | Crossword Clue |
|---|---|
| WWI | The U.S. joined it in 1917: Abbr. |
| WWI | The U.S. joined it in Apr. 1917 |
| WWI | What the U.S. joined in Apr. 1917 |
| STCROIX | Denmark sold it to the U.S. in 1917 |
| EDT | The U.S. Open is played on it: Abbr. |
| DST | 48 U.S. states observe it: Abbr. |
| EDT | Tennis's U.S. Open is played on it: Abbr. |
