What event names the severe U.S. stock-market collapse that began in October 1929?

The severe U.S. stock-market collapse that began in October 1929 is called the Wall Street Crash of 1929.

The market had risen dramatically during the 1920s, with widespread speculation and extensive buying on margin. Prices began falling in October, and selling intensified on Black Thursday, October 24, followed by Black Monday and Black Tuesday on October 28 and 29.

The crash did not by itself create every condition of the Great Depression, but it severely damaged confidence, household wealth, banks, and businesses. The downturn then spread through lower investment, falling demand, bank failures, and international financial pressures.

A common mistake is treating October 29 as the only crash date. It was the most famous panic day, but the collapse unfolded over several trading sessions and the market continued declining afterward.