Which famous advertising slogan from 1971 was inspired by a real-life international project and became a cultural touchstone during the Cold War era?

The evolution of advertising slogans represents a fascinating timeline of both commercial history and cultural shifts. From the earliest print advertisements to today's digital campaigns, slogans have captured the essence of their eras while shaping consumer behavior. This trivia challenges your knowledge about one of history's most influential advertising slogans that transformed product marketing and created a lasting legacy.

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Coca-Cola's 'I'd Like to Buy the World a Coke' (which evolved into 'It's the Real Thing')
Volkswagen's 'Think Small' campaign for the Beetle
De Beers' 'A Diamond is Forever'
McDonald's 'You Deserve a Break Today'