The 1929 Wall Street crash day on October 29 was called Black Tuesday.
Black Tuesday followed Black Thursday, October 24, and Black Monday, October 28, during the dramatic collapse of U.S. share prices. On October 29, investors traded roughly 16 million shares on the New York Stock Exchange, a record at the time. The Dow Jones Industrial Average fell about 12%, although the percentage decline was smaller than on October 28.
The crash did not single-handedly cause the Great Depression. It exposed severe weaknesses, including excessive speculation, buying shares on margin, falling industrial production, and fragile banks. The wider economic downturn continued for years, and the Dow did not regain its 1929 peak until 1954. Black Tuesday is often confused with the whole 1929 crash, but it specifically identifies October 29, the final major day in that week’s initial selling wave.