From the 1920s to the 1950s, independent women photographers around the world helped create the New Woman, a model of newfound freedom and self-determination in life and art. Their work ranged from studio portraits, street photography, sports, and fashion to avant-garde experiments. Andrea Nelson, associate curator of photography at the National Gallery of Art, talks about the trailblazing “new women” behind some of the most iconic images of the twentieth century.