Which of these famous brand slogans was first introduced during the Great Depression and was specifically designed to boost morale during economic hardship?

Throughout history, certain brand slogans have become so iconic that they've transcended mere marketing to become cultural touchstones. These powerful taglines not only defined companies but often reflected significant historical moments and societal shifts. Test your knowledge of these landmark slogans that changed the course of advertising history and shaped consumer culture as we know it today.

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De Beers' "A Diamond is Forever" (1948)
Kellogg's "They're Gr-r-reat!" (1952)
Coca-Cola's "The Pause That Refreshes" (1929)
Maxwell House's "Good to the Last Drop" (1915)