Answer:
Explanation: The Progressive Era (late 1890s – late 1910s) was a period of widespread social activism and political reform across the United States focused on defeating corruption, monopoly, waste and inefficiency. The main themes ended during American involvement in World War I (1917–1918) while the waste and efficiency elements continued into the 1920s.[1][2] Progressives sought to address the problems caused by rapid industrialization, urbanization, immigration, and political corruption; and by the enormous concentration of industrial ownership in monopolies. They were alarmed by the spread of slums, poverty, and what they perceived as the exploitation of labor. Multiple overlapping progressive movements fought perceived social, political and economic ills by advancing democracy, scientific methods, professionalism and efficiency; regulating businesses, protecting the natural environment, and improving working conditions in factories and living conditions of the urban poor.[3] Spreading the message of reform through mass-circulation newspapers and magazines by "probing the dark corners of American life" were investigative journalists known as “muckrakers". The main advocates of progressivism were often middle-class social reformers.