...continuation of previous note.
http://www.historyplace.com/unitedstates/childlabor/whitnel.jpg

Although many of these photographs are unique and amazing images that portray the world we live in like nothing else could, I believe the statement that they "changed the world" is exaggerated for most of them. If you want an example of a photographer who made a concrete impact on the world in which he lived, read up on Lewis Hine. His photographs of children working in factories effectively began a public outcry that led to the United States' first child labor laws. This one, of a girl in a textile mill is one of his better known photographs.