Answer:
He helped photography be seen as a real art form
Step-by-step explanation:
Alfred Stieglitz is one of the pioneer photographers who lived and worked at the end of the 19th and beginning of the 20th century. During his time, photography was relatively new and was not seen as artistic as traditional art forms.
However, Stieglitz considered himself an artist, made exhibitions of his work, and strongly promoted photography as an art form. He wrote articles advocating his point of view, listing the aesthetic components of photography. His very explorative and artistic photos have also helped to established this craft as the real and praised art form.