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

Throughout retail history, certain marketing campaigns have fundamentally changed how we shop. Black Friday has become a global shopping phenomenon, but its origins are often misunderstood. Test your knowledge about this historic retail tradition that transformed holiday shopping patterns and created one of the most significant annual revenue opportunities for retailers worldwide.

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1950s, when suburban shopping malls first opened
1960s, when Philadelphia police used it to describe traffic chaos
1970s, when retailers first used it to mark the day their finances went from 'red' to 'black'
1980s, when major department stores coordinated their post-Thanksgiving sales