| 100% | ANGELS | 6 | One of the first two MLB expansion teams |
| 57% | BUFFALOBILL | 11 | One of the first two ''American superstars,'' per 34 Across' book |
| 57% | ANNIEOAKLEY | 11 | One of the first two ''American superstars,'' per 34 Across' book |
| 57% | REDSOX | 6 | One of two MLB teams with three World Series titles in the 21st century (2 wds.) |
| 57% | WASHINGTON | 10 | One of the first two states to permit marijuana for recreational use |
| 57% | COLORADO | 8 | One of the first two states to permit marijuana for recreational use |
| 56% | OMAR | 4 | Ilhan ___, one of the first two Muslim women elected to Congress |
| 54% | OMAR | 4 | Minnesotan Ilhan who is one of the first two Muslim women elected to Congress |
| 54% | TENZINGNORGAY | 13 | Sherpa who was one of the first two people to conquer Mount Everest: 2 wds. |
| 53% | EDMUNDHILLARY | 13 | New Zealand mountaineer who was one of the first two people to conquer Mount Everest: 2 wds. |
| 52% | LACLIPPERS | 10 | One of the only two NBA teams that share an arena |
| 51% | FINALIST | 8 | One of two teams vying to be the ultimate winner |
| 49% | ELSA | 4 | One of two Disney characters singing "For the First Time in Forever" |
| 48% | OLDS | 4 | One of the first automakers |
| 48% | APOSTLE | 7 | One of the first disciples |
| 48% | CREE | 4 | One of the First Nations |
| 48% | ADAM | 4 | One of the first mates |
| 48% | ATOMICPILE | 10 | The first one of these was built by Fermi and his team in 1942 |
| 48% | DEVILRAYS | 9 | MLB expansion team that played its first regular season game against the Tigers on March 31, 1998 (2 wds.) |
| 48% | INCA | 4 | One of the first potato farmers |
| 47% | CREE | 4 | One of the First Nations of Canada |
| 47% | JAMESMONROE | 11 | One of the first five 49-Acrosses |
| 47% | JOHNADAMS | 9 | One of the first five 49-Acrosses |
| 47% | THOMASJEFFERSON | 15 | One of the first five 49-Acrosses |
| 47% | AOL | 3 | One of the first Internet service providers |
| 47% | NEWYORK | 7 | Northeastern state that's the first part of two NFL teams' names: 2 wds. |
| 47% | PADRES | 6 | One of five MLB teams that has appeared in the World Series but never won the title |
| 47% | CHATROOM | 8 | One of the first ways to communicate online |
| 47% | COBB | 4 | One of the first five inductees at Cooperstown |
| 47% | SIT | 3 | One of the first commands a puppy learns |