Which iconic entertainment brand has used the slogan "The Happiest Place On Earth" since the 1950s?

Brand slogans have become deeply embedded in our pop culture, often transcending their products to become cultural touchstones. Some have remained remarkably consistent for decades, while others have evolved with changing times. This trivia question focuses on one of the most recognizable brand slogans in entertainment history and how it has maintained its cultural relevance across generations.

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Disneyland
Universal Studios
Six Flags
Warner Bros. Movie World