Ось більшість статей вказують на таке. The real history behind Black Friday, however, is not as sunny as retailers might have you believe. Back in the 1950s, police in the city of Philadelphia used the term to describe the chaos that ensued on the day after Thanksgiving, when hordes of suburban shoppers and tourists flooded into the city in advance of the big Army-Navy football game held on that Saturday every year. Not only were Philly cops not able to take the day off, but they had to work extra-long shifts dealing with the additional crowds and traffic. Shoplifters also took advantage of the bedlam in stores and made off with merchandise, adding to the law enforcement headache.
