In which decade did the term 'Black Friday' first become widely used to describe the day after Thanksgiving shopping phenomenon?

Black Friday has become one of the most significant shopping events in retail history, transforming how consumers and businesses approach the holiday shopping season. This trivia question explores the historical origins of this retail phenomenon that now generates billions in sales worldwide and has evolved from a single day to an extended shopping period that shapes retail strategies, consumer behavior, and economic patterns across the globe.

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1950s, when Philadelphia police used it to describe the chaos of shoppers and tourists flooding the city after Thanksgiving
1970s, when retailers began using it to reference the day their accounting books went from 'red' (losses) to 'black' (profits)
1980s, when major department stores coordinated the first nationwide post-Thanksgiving sales event
1990s, when the internet enabled nationwide awareness of deals, creating the first coordinated shopping holiday