| 100% | HAITI | 5 | The world's first Black-led republic |
| 56% | SPUTNIK | 7 | The world's first constructed satellite |
| 54% | NAURU | 5 | Pacific island; the world's smallest republic |
| 53% | FRANZ | 5 | Ferdinand whose death led to the First World War |
| 52% | LONDON | 6 | Site of the world's first subway |
| 52% | NAPLES | 6 | Site of the world's first pizzeria |
| 52% | YELLOWSTONE | 11 | The world's first national park, located in Wyoming, Montana, and Idaho |
| 51% | PHILLISWHEATLEY | 15 | First Black published poet in the U.S. |
| 51% | HATH | 4 | Verb in the world's first telegraph message |
| 51% | SEIKO | 5 | Maker of the world's first quartz watch |
| 51% | ASHE | 4 | First Black man to win the U.S. Open |
| 51% | SHIRLEYCHISHOLM | 15 | First Black woman elected to the U.S. Congress |
| 51% | NEWHAVEN | 8 | City with the world's first telephone directory (1878) |
| 51% | NIHAO | 5 | "Hello," in the world's most common first language |
| 51% | TELETHON | 8 | Milton Berle hosted the world's first one |
| 51% | SNUPPY | 6 | Afghan hound, the world's first cloned dog |
| 51% | SMALLPOX | 8 | Disease eradicated by the world's first vaccine |
| 50% | BOSTON | 6 | Site of the world's first city marathon in 1897 |
| 50% | MERCEDESBENZ | 12 | Maker of the world's first diesel-powered passenger car |
| 49% | LAOS | 4 | One of the world's last remaining People's Democratic Republics |
| 49% | DAVIS | 5 | Benjamin ___, first black general in the U.S. Army |
| 49% | MANNHEIM | 8 | Where Karl Benz debuted the world's first auto |
| 49% | RCA | 3 | Co. that launched the world's first communications satellite |
| 49% | OWEN | 4 | ___ Hurcum, the world's first openly nonbinary mayor |
| 48% | UCLA | 4 | SoCal school where the world's first internet transmission was made |
| 48% | LOUISE | 6 | __ Brown, the world's first IVF baby, born in 1978 |
| 48% | TULIP | 5 | Flower that caused the world's first economic bubble in the 1630s |
| 47% | CAROL | 5 | ___ Moseley Braun, first black woman elected to the U.S. Senate |
| 47% | OPEL | 4 | Automotive company that conducted the world's first rocket-powered flights |
| 47% | SANTO | 5 | The first word in the Dominican Republic's capital |