What name is given to the 29 October 1929 U.S. stock-market collapse?

The 29 October 1929 U.S. stock-market collapse is known as Black Tuesday.

Black Tuesday marked the most famous day of the Wall Street Crash. About 16 million shares changed hands on the New York Stock Exchange, a record at the time, and the Dow Jones Industrial Average fell sharply. The selling followed Black Thursday on 24 October and Black Monday on 28 October, making the final October collapse a sequence rather than a single isolated event.

The crash did not by itself cause the entire Great Depression, but it intensified a downturn already developing in the United States. Banks failed, businesses reduced investment, and unemployment rose. The Depression also spread internationally through falling trade and financial links.

A common mix-up is treating Black Tuesday as the first day of the 1929 crash. Black Thursday came earlier, while Black Tuesday is the date most closely associated with the dramatic final sell-off.