The correct answer to this open question is the following.
I think the piece of legislation I feel was most helpful in improving conditions for children in the workplace was the Keating-Owen Act of September 1916.
This act was a great effort of United States President Woodrow Wilson to make important changes regarding the hours and age at which children worked. In the end, the act did not result in what he has originally had considered.
Although President Woodrow Wilson signed into law the Keating-Owen Act of September 1916, he was unsuccessful in making lasting changes regarding the hours and age at which children worked. The act tried to prohibit the sale of products of companies that used children in the fabrics. It also applied to the mine industry or companies that used children to work overnight turns.
A previous attempt to regulate child labor was the Factory Act of 1833 that aimed to improve the conditions in the workplace.
