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

Test your knowledge about one of the most significant retail phenomena in modern commerce! Black Friday has transformed from a local shopping tradition to a global retail event driving billions in sales annually. But how well do you know the origins of this shopping extravaganza that kicks off the holiday shopping season and influences retail strategies worldwide?

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The day retail stores' accounting ledgers went from 'red' (loss) to 'black' (profit) for the year
A 1950s term used by Philadelphia police to describe the chaotic traffic and crowds the day after Thanksgiving
A retail marketing campaign created by department stores in the 1970s
The day President Franklin D. Roosevelt officially moved Thanksgiving to extend the shopping season