Why was the day after Thanksgiving originally called 'Black Friday' in the 1960s?

Black Friday has become a global shopping phenomenon, but its origins are uniquely American. This retail tradition marks the unofficial start of the holiday shopping season and has transformed from a local Philadelphia term to an international retail event generating billions in sales. Test your knowledge about how this massive shopping day got its name and its economic significance!

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Because retailers' accounting ledgers went from red (loss) to black (profit) on this day
Because Philadelphia police used the term to describe the chaotic traffic and pedestrian congestion from shoppers
Because stores were historically decorated with black signage to announce sales
Because it marked the day when factory workers called in sick after Thanksgiving, leaving production lines 'in the black'