| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| who proposed the sixteenth amendment | 0.9 | 0.3 | 2336 | 66 |
| who created the 16th amendment | 1.37 | 0.5 | 437 | 81 |
| who came up with the 16th amendment | 0.83 | 0.7 | 6623 | 41 |
| who made the 16th amendment | 0.02 | 0.3 | 4317 | 69 |
| who introduced the 16th amendment | 0.76 | 0.5 | 9978 | 71 |
| who created the 16 amendment | 0.23 | 0.7 | 2020 | 27 |
| who made the 16 amendment | 0.36 | 0.2 | 3675 | 29 |
| when was the 16th amendment proposed | 1.24 | 0.6 | 8319 | 3 |
| who wrote the 16th amendment | 0.51 | 0.4 | 80 | 48 |
| why was the sixteenth amendment introduced | 0.02 | 1 | 6426 | 40 |
| why was the sixteenth amendment created | 1.31 | 0.6 | 2898 | 34 |
| when was the sixteenth amendment added | 1.44 | 0.9 | 3273 | 82 |
| who proposed the fifteenth amendment | 1.24 | 0.1 | 7508 | 1 |
| who passed the 16th amendment | 1.25 | 0.6 | 9529 | 8 |
| who signed the 16th amendment | 1.66 | 0.7 | 9012 | 35 |
| what did the 16th amendment create | 1.22 | 1 | 2482 | 58 |
| what led to the 16th amendment | 1.25 | 0.8 | 9925 | 69 |
| the 16th amendment established | 1.68 | 0.9 | 1312 | 27 |
| history of the 16th amendment | 1.07 | 0.9 | 3685 | 93 |
| when was the 16th amendment created | 1.17 | 0.3 | 8511 | 95 |
