The October 29, 1929 stock-market collapse in the United States is commonly called Black Tuesday.
Black Tuesday followed Black Thursday, October 24, and Black Monday, October 28, during a dramatic breakdown on the New York Stock Exchange. On October 29, about 16 million shares changed hands, a trading record at the time, while the Dow Jones Industrial Average fell sharply.
The crash did not single-handedly cause the Great Depression, but it destroyed substantial paper wealth and intensified already serious economic weaknesses. Banks, businesses, and households reduced spending and investment as confidence collapsed. The downturn then spread internationally through trade and finance.
Black Tuesday is sometimes confused with the entire 1929 Wall Street Crash. The broader crash unfolded over several trading days, while Black Tuesday specifically identifies October 29. The Dow did not regain its September 1929 peak until 1954.