Final answer:
Alfred Stieglitz played a role in introducing new European sculpture and painting to Americans.
Step-by-step explanation:
The role in introducing new European sculpture and painting to Americans was played by Alfred Stieglitz. Stieglitz was a prominent art dealer, photographer, and curator who was instrumental in promoting modern art in America during the late 19th and early 20th centuries. He introduced American audiences to the works of influential European artists such as Pablo Picasso, Auguste Rodin, and Constantin Brâncuși through his galleries and exhibitions.