Final answer:
Florence Kelley formed the Women's Trade Union League to advocate for laws that would benefit women working in factories, such as an eight-hour workday law. Her efforts were initially met with resistance but gained momentum after a tragic fire in 1911. This incident helped shift public opinion and led to the establishment of workplace safety laws and codes.
Step-by-step explanation:
Florence Kelley formed the Women's Trade Union League to push for laws that would benefit women working in factories. As the first general secretary of the National Consumers League, Kelley championed the cause of improving factory working conditions and advocated for an eight-hour workday law to protect women in the workplace. Her efforts were met with resistance from factory owners, but a tragic fire in 1911 helped shift public opinion in favor of workplace safety laws and codes.