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 and railroads, 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.