The emergence of labor union movements in the United States was driven by the industrialization of the late 19th and early 20th centuries. Poor working conditions, long hours, and low wages prompted workers to organize for better rights and protections. Key events, such as the Homestead Strike and the Pullman Strike, highlighted the struggles of workers and the need for collective bargaining. The formation of labor organizations, such as the American Federation of Labor (AFL), enabled workers to demand fair treatment, significantly influencing labor policies and worker rights in the following decades.