How did "Black Friday" come about during Thanksgiving in the West?

The "Black Friday" during Thanksgiving in the West was originally used as a joke to refer to the extremely bad traffic conditions on the day after Thanksgiving. Because a large number of enthusiastic customers poured into the city center that day, the congestion on the roads became the worst of the year.

Early citations in the Oxford English Dictionary suggest that "Black Friday" may have spread among police and bus drivers, who undoubtedly feared the day when traffic was so heavy. The word "black" refers to "an occasion where tragic or catastrophic events occur" or "a situation that leads to feelings of despair or pessimism", although the use of the word is understood to be a tongue-in-cheek reference.

There is also a theory that on Friday, September 24, 1869, several speculators tried to monopolize the U.S. gold market, and the response plan adopted by then U.S. President Ulysses Grant was: All the gold held by the government was put on the market, which caused the price of gold to plummet, which in turn triggered a panic in the securities market.