The movement of organized labor began in the United States in 1867, advocating for workers' rights and conditions through collective action. This marked the foundation of significant changes in labor dynamics, leading to future reforms. Other movements such as factory inspections and workers' compensation came later, making organized labor the best answer for this date.
;
In 1867, the movement of organized labor began in the United States, advocating for workers' rights and better working conditions through collective organization. This period marked the foundation of significant changes in labor dynamics, laying the groundwork for future legislation. Other movements, such as factory inspections and workers' compensation laws, developed later than 1867. ;