What was the name of the day when U.S. stocks collapsed on October 29, 1929?

The U.S. stock-market collapse on October 29, 1929, was called Black Tuesday.

On that day, roughly 16 million shares changed hands on the New York Stock Exchange, a record at the time. The Dow Jones Industrial Average dropped about 12 percent, following severe losses on Black Thursday, October 24, and Black Monday, October 28.

Black Tuesday is often treated as the symbolic climax of the Wall Street Crash of 1929, although prices continued falling afterward. The crash helped usher in the Great Depression, but historians generally identify multiple causes, including excessive speculation, margin buying, weakening industrial output, and financial instability.

A common mistake is to use Black Tuesday as the name for the entire crash. More precisely, it refers to the specific trading day, while “Wall Street Crash of 1929” describes the broader market collapse.