| Clue | Source | Date |
|---|---|---|
| Wash. and Tex. both form part of it | The Washington Post Sunday | 20 Mar 2022 |
| Part of it was a 2016 campaign issue | LA Times Daily | 19 May 2018 |
| Part of it was a 2016 campaign issue | The Washington Post | 19 May 2018 |
| Part of it was a 2016 campaign issue | ||
| It runs through four Great Lakes | ||
| It runs through four Great Lakes |