The main focus of the American Progressivism movement in the early 20th century was to address social, political, and economic issues brought about by industrialization, urbanization, and social stratification. Reformers aimed to eliminate corruption in government, improve public health, enhance labor conditions, and promote social justice through legislation. Key figures like Theodore Roosevelt and Jane Addams advocated for women's suffrage, workers’ rights, and regulatory policies to rein in corporate power. The movement sought to use scientific principles and reform measures to improve society, believing in the possibility of human progress through collective action and governmental reform.