In the 1929 Wall Street Crash, October 29 was nicknamed Black Tuesday.
The Dow Jones Industrial Average fell about 12.8% on that day as investors rushed to sell shares. The session followed Black Thursday, October 24, and Black Monday, October 28, when severe declines had already shaken confidence. The crash was centered on the New York Stock Exchange but affected markets and economies internationally.
Black Tuesday is often treated as the symbolic climax of the 1929 crash, although the market continued falling afterward. The Dow did not reach its low until July 1932, when it was roughly 89% below its September 1929 peak.
The crash helped intensify the Great Depression, but it did not alone cause every part of that worldwide economic crisis. Bank failures, falling demand, debt, protectionist policies, and monetary decisions also played important roles.