Which famous slogan was created during World War II, originally as government propaganda, before being commercially adopted decades later?

Throughout history, certain brand slogans have transcended mere marketing to become cultural phenomena that defined eras and influenced society. These powerful phrases didn't just sell products - they captured the zeitgeist of their times and sometimes even helped shape historical events. Test your knowledge of how brand messaging has intersected with significant moments in history!

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Keep Calm and Carry On
Just Do It
Think Different
I'm Lovin' It