| Similarity | Rank | |
|---|---|---|
| U.S._history | 0.820 | 74846 |
| world_history | 0.700 | 28733 |
| European_history | 0.685 | 79644 |
| in_American_history | 0.666 | 33694 |
| American_literature | 0.654 | 78300 |
| World_history | 0.654 | 92874 |
| history | 0.641 | 354 |
| the_American_revolution | 0.641 | 61560 |
| military_history | 0.625 | 45278 |
| modern_history | 0.624 | 93951 |
| the_American_Civil_War | 0.622 | 99889 |
| the_Civil_War | 0.622 | 11655 |
| political_history | 0.622 | 61414 |
| cultural_history | 0.621 | 33672 |
| American_politics | 0.619 | 72074 |
| Jewish_history | 0.604 | 58258 |
| American_government | 0.597 | 96293 |
| the_Civil_Rights_Movement | 0.595 | 62659 |
| history_lesson | 0.589 | 90908 |
| our_history | 0.575 | 12200 |
| American_Literature | 0.575 | 97833 |
| social_study | 0.573 | 20655 |
| American_culture | 0.572 | 27826 |
| music_history | 0.572 | 86096 |
| civics | 0.567 | 66474 |