What was the name of the 1929 U.S. stock-market collapse marked by Black Tuesday?

The 1929 U.S. stock-market collapse marked by Black Tuesday was the Wall Street Crash of 1929.

After years of rapidly rising share prices and widespread buying on margin, the market became increasingly vulnerable to a reversal. Prices fell sharply on Black Thursday, October 24, 1929, and panic selling intensified over the following days. Black Tuesday, October 29, brought one of the most famous single-day sell-offs in the history of the New York Stock Exchange.

The crash did not by itself cause every feature of the Great Depression, but it helped deepen economic contraction and damaged confidence. Bank failures, falling production, unemployment, and debt problems continued through the early 1930s. The United States economy had already begun weakening before the October collapse.

Black Monday is a separate term commonly associated with the worldwide market crash of October 19, 1987. The 1929 crash is also sometimes called the Great Crash, but its standard historical name identifies Wall Street and the year.