Final answer:
World War II and the Studio System contributed to Hollywood's global film industry dominance by 1945.
Explanation:
World War II and the Studio System played significant roles in Hollywood's domination of the global film industry by 1945. World War II led to a decline in European filmmaking due to the impact of the war and the rise of neorealism post-war, allowing Hollywood to emerge as the dominant force. The Studio System's vertical integration by major studios like Warner Bros., MGM, RKO, 20th Century Fox, and Paramount gave Hollywood control over all aspects of film production, distribution, and exhibition, solidifying its dominance.
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