The progressive era was a time of social and political reform. Here are some of the most influential people of this time.
Jacob Riis- he was a photographer who took pictures of poor areas and slums to influence social change
Florence Kelley- worked to reform working conditions for children in sweatshops
Ida B. Wells- African American journalist who covered stories over lynching and encouraged social reform
John Dewey- encouraged educational reform in schools
Upton Sinclair- exposed a meatpacking company in his book to promote reform
Hope this helps! :)