Britannica: Origins of progressivismGenerally speaking, progressivism was the response of various groups to problems raised by the rapid industrialization and urbanization that followed the Civil War. These problems included the spread of slums and poverty; the exploitation of labour; the breakdown of democratic government in the cities and states caused by the emergence of political organizations, or machines, allied with business interests; and a rapid movement toward financial and industrial concentration.
United States 2016. Britannica School. Retrieved 17 November 2016, from http://school.eb.com.au/levels/high/article/111233#77840.toc