What are some of the positive changes states made to enhance conditions for workers?

longer hours for more money
provision for a minimum wage
the concept of overtime pay
workmen's compensation
fewer regulations that hindered production
banning employment of children

The correct answers are: "provision for a minimum wage", "workmen's compensation" and "banning employment of children". Among the positive changes states made to improve workers conditions, it is of great relevance the ones related to improving the wage and prohibiting underage exploitation. The activism that made this possible include the National Child Labor Committee formed in 1904, and the Fair Labor Standards Act (FLSA) that stands the minimum wages for workers.

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d is the right answer