Final answer:
The women's rights movement had the most positive, lasting impact on society during the Progressive Era.
Step-by-step explanation:
The reform movement that had the most positive, lasting impact on society to this day during the Progressive Era was the women's rights movement. This movement fought for freedom and emancipation, and sought to grant greater rights to women, who were on the periphery of American society at that time. The organized women's rights movement grew out of abolitionist organizations and saw great advances, although its ultimate goals were not fully achieved during the era of reform. The movement paved the way for subsequent waves of feminism and laid the foundation for women's rights that continue to shape society today.