The early 20th century is often referred to as the Golden Age of Hollywood, during which major studios such as Warner Bros., Paramount Pictures, and Universal Studios dominated the film industry. These studios produced some of the most iconic movies of all time, including classics like "Casablanca," "The Wizard of Oz," and "King Kong." The studio system, which involved a centralized production model where studios controlled every aspect of filmmaking, from production to distribution, was the norm during this period.