| Similarity | Rank | |
|---|---|---|
| postwar | 0.857 | 10130 |
| inter-war | 0.793 | 11074 |
| interwar | 0.786 | 19545 |
| 1930 | 0.785 | 4100 |
| 1950 | 0.752 | 3691 |
| pre-war | 0.736 | 9050 |
| post-1945 | 0.735 | 34032 |
| 1960 | 0.732 | 2807 |
| era | 0.714 | 3452 |
| 1980 | 0.710 | 2404 |
| mid-1960 | 0.710 | 49947 |
| post-imperial | 0.709 | 52458 |
| mid-to-late | 0.706 | 71501 |
| 1970 | 0.705 | 2583 |
| 1940 | 0.702 | 7398 |
| post-cold | 0.698 | 48448 |
| wartime | 0.698 | 5816 |
| 1920 | 0.698 | 5459 |
| mid-1930s | 0.697 | 38645 |
| retrenchment | 0.694 | 28727 |
| spanish-american | 0.690 | 58917 |
| post-second | 0.687 | 71536 |
| mid-1970 | 0.682 | 12406 |
| strains | 0.677 | 78087 |
| quarter-century | 0.673 | 53467 |