Hollywood's rise in the early 20th century transformed entertainment. As nickelodeons gave way to grand theaters, American studios seized global dominance. The industry flourished amid post-war prosperity, urbanization, and social change, with Los Angeles becoming the new filmmaking hub. The studio system emerged, with major players like Paramount and MGM controlling production, distribution, and exhibition. This vertically integrated model, coupled with technological advancements and the star system, allowed Hollywood to churn out diverse genres and iconic films that shaped American culture.