Final answer:
The history of the labor movement is about workers coming together to gain rights and a voice in society, with the answer being 'rights, voice'. Unions played an integral role in advocating for safer working conditions and fair wages, and key legislation has recognized and supported these collective efforts.
Step-by-step explanation:
The history of the labor movement is the history of working Americans uniting to secure fundamental economic and political rights, and to ensure they have a voice in American society. The correct completion of the blank spaces in the sentence provided would hence be: 1) rights, voice. This reflects the endeavors of labor unions to advocate for better wages, safer working conditions, and comprehensive benefits while striving for an influence over political and economic policies affecting their livelihood.
Labor unions have been a significant force in crafting safer workspaces, securing fair pay, and enforcing regulations such as the eight-hour workday. Over the years, legislation such as the National Labor Relations Act of 1935 and the Fair Labor Standards Act of 1938 has empowered workers by granting the right to unionize, engage in collective bargaining, and set minimum wages and maximum working hours. The transformation from sporadic protests to organized movements illustrates the increasing importance of workers having collective representation to negotiate with employers and influence legislation to protect their interests.