The U.S. stock-market crash on October 24, 1929, was called Black Thursday.
Black Thursday marked the first major panic day of the Wall Street Crash of 1929. Heavy selling overwhelmed the New York Stock Exchange, and the Dow Jones Industrial Average fell sharply amid unusually high trading volume. Leading bankers temporarily calmed the market by buying prominent stocks, but the relief did not last.
The crash continued through the following week, including Black Monday on October 28 and Black Tuesday on October 29. Black Thursday is sometimes confused with Black Tuesday because October 29 became the most famous single day of the collapse. The wider crash helped deepen the Great Depression, although the depression had multiple causes, including banking failures, falling demand, and international financial weakness.