<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Progressivism in the United States is a broadly based reform movement that reached its height early in the 20th century and is generally considered to be middle class and reformist in nature . It arose as a response to the vast changes brought by modernization, such as the growth of large corporations, pollution and fears of corruption in American politics . In the 21st century, progressives continue to embrace concepts such as environmentalism and social justice . Social progressivism, the view that governmental practices ought to be adjusted as society evolves, forms the ideological basis for many American progressives . </P> <P> Historian Alonzo Hamby defined progressivism as the "political movement that addresses ideas, impulses, and issues stemming from modernization of American society . Emerging at the end of the nineteenth century, it established much of the tone of American politics throughout the first half of the century ." </P>

The progressive movement grew out of which earlier movement