Social change during the Progressive Era in the United States was driven by various factors including industrialization, urbanization, and increasing immigration. These developments created social challenges such as poor working conditions, child labor, and political corruption. Reformers sought to address these issues through activism and legislation, leading to key changes like women's suffrage, labor rights, and antitrust laws. The movement emphasized the role of government in improving society and promoting social justice. Progressive leaders played a crucial role in mobilizing public opinion and enacting reforms, paving the way for future social movements in the 20th century and beyond.