The Wikipedia page on the American Civil War provides a comprehensive overview of the war that took place in the United States between 1861 and 1865.

Dorothea Lange was an influential American documentary photographer and photojournalist best known for her insightful and poignant images depicting the effects of the Great Depression on Americans.

Jacob Riis was a Danish-American journalist and social reformer who dedicated his life to exposing the harsh living conditions of New York City's poor immigrants in the late 19th century.

Lewis Hine was an American sociologist and photographer known for his influential work documenting child labor in the United States.

Migrant Mother is a photograph taken in 1936 in Nipomo, California, by American photographer Dorothea Lange during her time with the Resettlement Administration (later the Farm Security Administration).

The Museum of Modern Art (MoMA) is an internationally renowned art museum located in New York City.

Photojournalism is journalism that uses images to tell a news story.