Which city is credited with first using the term 'Black Friday' to describe the shopping day after Thanksgiving, before it became a nationwide retail phenomenon?

While shopping festivals drive massive retail sales worldwide, their geographic origins reveal fascinating cultural and economic histories. Black Friday has transformed from a regional American phenomenon into a global retail event, but its exact origin story remains debated among retail historians. Test your knowledge about how geography influenced one of the world's largest shopping phenomena and how it spread across continents.

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Philadelphia, where police used the term in the 1950s to describe the chaotic crowds and traffic that overwhelmed the city after Thanksgiving
New York City, where department stores began using the term in the 1930s to mark the day their accounting books went from 'red' to 'black' for the year
Chicago, where retailers in the 1960s coordinated the first citywide post-Thanksgiving sale using 'Black Friday' as their marketing slogan
Los Angeles, where the term originated in the 1970s when shopping mall traffic caused 'black' smog conditions after Thanksgiving