The early 20th century marked the beginning of Hollywood's Golden Age, with the establishment of iconic studios such as Warner Bros., Paramount Pictures, and Universal Studios. These studios revolutionized the film industry by introducing a new era of mass production, distribution, and marketing. They produced some of the most iconic films of all time, including Casablanca , The Wizard of Oz , and Gone with the Wind , which continue to captivate audiences today. The studio system, which dominated Hollywood during this period, allowed for efficient production, talent management, and distribution, cementing the studios' position as the epicenter of the entertainment industry.