Development from Progressive Reformers' Efforts

The Progressive Era in the United States brought forth significant reforms at both federal and state levels aimed at addressing a multitude of social issues, economic inequalities, and political corruption. One notable aspect of these reforms was the emergence of regulatory agencies and legislation that sought to protect consumers and workers and to curb the excesses of industrial capitalism. Among these, certain laws and organizations are often cited as critical in shaping the regulatory landscape of the time.

Which of the following developments most directly resulted from the efforts of Progressive reformers to improve labor conditions and consumer protection in early 20th-century America?