Final answer:
William Frederick "Buffalo Bill" Cody popularized the Wild West Show for Eastern and European audiences with his traveling show that provided a romanticized and simplified portrayal of Western history.
Step-by-step explanation:
The person who popularized the Wild West Show for Eastern and European audiences was William Frederick "Buffalo Bill" Cody. His traveling exhibition, known as Buffalo Bill's Wild West Show, combined elements of vaudeville entertainment with a romanticized version of Western history. It featured dramatic reenactments such as "Indian attacks," which drew crowds and helped shape the public perception of the American West. Buffalo Bill's portrayal of Native Americans and Western life simplified complex histories and painted a sanitized and inaccurate image that audiences found thrilling. Although the image was not an accurate representation of Native American cultures or Western history, it significantly impacted the collective memory of the American West.