October 29, 1929, the worst selling day of the Wall Street Crash, is known as Black Tuesday.
The Dow Jones Industrial Average fell 12.8% that day as investors rushed to sell shares. The collapse followed Black Thursday on October 24 and Black Monday on October 28, when heavy selling had already shaken confidence. Banks and financiers attempted to stabilize prices, but the effort did not end the panic.
The crash did not by itself cause the entire Great Depression, but it helped destroy wealth and confidence. Bank failures, falling production, unemployment, and reduced consumer spending followed. A common mix-up is calling October 24 Black Tuesday; that date is Black Thursday. The market's decline continued after October 29, with the Dow eventually losing almost 89% from its 1929 peak to its 1932 low.