Progressivism was a reform movement in the United States that targeted many of the social problems related to industrialization and urbanization in the United States. The movement is usually thought to have begun in the late nineteenth century and to have ended with World War I. Progressives advocated a gamut of reforms including better working conditions, cleaning up political corruption, safer food and drugs, temperance, and the regulation of big business. Generally speaking, they argued to the role of both experts and the government in formulating responses to these problems. The Progressive movement is usually associated with the upper middle class in the United States. Politically, the movement included Presidents Theodore Roosevelt, William Howard Taft, and Woodrow Wilson as well as other politicians including Robert LaFollette of Wisconsin. Other Progressives included Jane Addams, Ida Tarbell, Jacob Riis, and Walter Lippmann.