| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| why were labor unions formed in the 1800s | 1.44 | 0.2 | 5563 | 29 |
| did labor unions work in the 1800s | 1.99 | 0.3 | 2911 | 82 |
| labor unions in the 1800s | 1.28 | 0.8 | 7198 | 46 |
| why were unions needed in the 1800s | 0.87 | 0.2 | 5589 | 82 |
| why were labor unions formed | 1.63 | 0.2 | 6323 | 64 |
| labor unions in the late 1800s | 0.1 | 0.9 | 4367 | 69 |
| why were labor unions started | 0.94 | 0.3 | 6992 | 55 |
| why were labor unions established | 0.3 | 0.5 | 8391 | 30 |
| why were labor unions created | 1.56 | 0.8 | 1850 | 65 |
| early labor unions 1800s | 1.3 | 0.9 | 4102 | 51 |
| why did labor unions emerge | 0.57 | 1 | 7590 | 99 |
| why did labor unions start | 0.02 | 0.8 | 3491 | 15 |
| why did labor unions form | 0.94 | 0.5 | 8993 | 32 |
| why did workers form labor unions | 1.93 | 0.6 | 281 | 38 |
| labor unions 1800s america | 1.55 | 1 | 8963 | 63 |
| origins of labor unions | 0.53 | 1 | 326 | 8 |
