Which 1929 trading day is remembered as Black Tuesday in the United States?

Black Tuesday was October 29, 1929, the trading day associated with the climactic collapse of U.S. stock prices.

On that day, about 16 million shares changed hands on the New York Stock Exchange, a record at the time. The Dow Jones Industrial Average fell roughly 12%, following sharp losses on Black Thursday, October 24, and Black Monday, October 28. The selling ended the speculative boom of the 1920s and became the best-known opening episode of the Wall Street Crash of 1929.

The crash did not by itself cause the entire Great Depression, which also involved bank failures, deflation, falling production, and international economic problems. Another common mistake is calling October 24 Black Tuesday; that earlier day is known as Black Thursday. The market continued to decline after October 29 and did not reach its ultimate 1929–1932 low until July 1932.