Which 1929 U.S. market day became known as Black Tuesday?

The 1929 U.S. market day known as Black Tuesday was October 29, 1929.

On Black Tuesday, heavy selling hit the New York Stock Exchange and the Dow Jones Industrial Average fell 12%. The session followed Black Monday on October 28 and came after the panic associated with Black Thursday on October 24. Together, these October sessions became the most famous phase of the Wall Street Crash.

The crash followed years of rising share prices, widespread speculation, and purchases made with borrowed money. When prices turned down, margin calls forced many investors to sell, creating additional pressure. Banks and businesses were affected by the resulting loss of wealth and confidence.

Black Tuesday did not by itself cause the entire Great Depression. The depression had multiple causes, including banking failures, falling demand, international debt problems, and policy mistakes. The date is best understood as a major episode within the broader 1929–1933 economic collapse.