| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| when was 26th amendment passed | 1.57 | 0.2 | 4388 | 74 |
| when was 16th amendment passed | 1.23 | 0.7 | 7075 | 84 |
| why was the 26th amendment passed | 1.33 | 1 | 3121 | 85 |
| what year was the 26th amendment passed | 1.5 | 0.4 | 9171 | 39 |
| who passed the 26th amendment | 0.31 | 1 | 5280 | 12 |
| 26th amendment passed date | 1.51 | 0.2 | 8739 | 69 |
| why did the 26th amendment have to be passed | 0.21 | 0.6 | 2712 | 31 |
| 26th amendment passed | 0.58 | 0.9 | 7152 | 56 |
| when was 15th amendment passed | 0.03 | 0.1 | 508 | 64 |
| when was 15th amendment passed by congress | 0.51 | 0.4 | 3484 | 99 |
| why was the 16th amendment passed | 1.02 | 0.5 | 2845 | 46 |
| who passed the 16th amendment | 1.1 | 0.1 | 4864 | 99 |
| which president passed the 16th amendment | 1 | 0.8 | 9130 | 93 |
| 16th amendment passed date | 1.32 | 0.3 | 7218 | 77 |
| 16th amendment when was it passed | 0.03 | 0.8 | 6768 | 23 |
| who was president when 16th amendment passed | 0.59 | 0.1 | 2452 | 75 |
