| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | frontier | United States | Frontier is associated with the idea of exploration, expansion, and the development of untamed lands. | 1 |
| 2 | frontier | United States | Historically important as a symbol of westward expansion and opportunity for new beginnings | 1 |
| 3 | frontier | United States | Historically significant as an expansion of territory westward during the 19th century, associated with exploration and opportunity | 1 |
| 4 | frontier | United States | Symbolizes the westward expansion and the rugged, undeveloped territory | 1 |