The American Civil War was the first major conflict that was photographed extensively, bringing shocking and often horrific images to the front pages and into people's living rooms. Photography was extremely popular in the US at the time, and many photographers did not hold back from snapping even the most graphic of post-battle images to illustrate the horrors of war.
Several of the images in this gallery are graphic in nature and may be disturbing.
In the late 1970s, residents of Love Canal in Niagara Falls, NY discovered their neighborhood had been built on a former chemical waste dump. Housewives activated to create a grassroots movement that galvanized the landmark Superfund Bill.
Explore what happened when the small Mississippi town of Leland integrated its public schools in 1970. Told through the remembrances of students, teachers and parents, the film shows how the town – and America – were transformed.