During her assignment as a photographer for the Works Progress Administration (WPA), Dorothea Lange documented the movement of migrant families forced from their homes by drought and economic depression. This family was in the process of traveling 124 miles by foot, across Oklahoma, because the father was unable to receive relief or WPA work of his own due to an illness. Dorothea Lange, “Family walking on highway, five children” (June 1938) Works Progress Administration, Library of Congress.