What was the original meaning of the term 'Black Friday' before it became associated with post-Thanksgiving shopping?

Black Friday has become one of the most significant shopping festivals in retail history, transforming from a local phenomenon to a global retail event. Test your knowledge about the origins and evolution of this shopping extravaganza that now kicks off the holiday shopping season worldwide and generates billions in sales. Do you know how this retail phenomenon truly began?

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A 1950s factory worker term for the day they called in sick to start holiday shopping
A 1960s Philadelphia police term for the chaotic day between Thanksgiving and Army-Navy game
A retail accounting term when stores first recorded profits (went 'in the black') for the year
A marketing campaign created by Macy's in 1975 to boost post-Thanksgiving sales