The correct answer to this open question the following-
Although there are no options attached, we can say the following.
The organization of labor into unions eventually led to important reformations to reduce the working hours in the factories, to stop the inhuman child labor, Collective Bargaining, and to get some health benefits.
Let's have in mind that American workers used to labor under harsh and unhealthy conditions in closed spaces with no ventilation, and were exposed to accidents when they were operating the machines in the factories. They worked for long hours and received low pay.