| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| today in labor union history | 0.13 | 1 | 1119 | 84 |
| labor unions in history | 0.16 | 0.8 | 7159 | 14 |
| history of labor unions in the us | 1.19 | 0.4 | 8017 | 56 |
| the history of labor unions begins in | 0.4 | 0.5 | 9201 | 35 |
| history of labor unions in usa | 1.71 | 0.6 | 9834 | 76 |
| american labor union history | 1.77 | 0.5 | 4204 | 98 |
| history of labor unions in america | 1.67 | 0.9 | 6947 | 41 |
| history of american labor unions | 0.53 | 0.8 | 2967 | 98 |
| when did the labor union start | 1.22 | 0.2 | 1193 | 48 |
| history of labor unions in the united states | 0.68 | 0.8 | 4806 | 75 |
| labor unions definition us history | 0.36 | 0.6 | 5268 | 76 |
| define labor union in history | 0.45 | 0.3 | 2586 | 1 |
