On which date did the 1929 Wall Street Crash’s first major selling day, Black Monday, occur?

Black Monday during the 1929 Wall Street Crash occurred on October 28, 1929.

The Dow Jones Industrial Average fell 12.82% that day, then dropped another 11.73% on October 29, a date remembered as Black Tuesday. The two sessions intensified the panic that had begun with heavy selling on October 24, often called Black Thursday.

The crash followed a decade of rapid economic expansion and widespread speculation in U.S. shares. Many investors bought stocks with borrowed money, so falling prices forced brokers to demand additional cash or sell holdings. This created further downward pressure.

The crash did not by itself cause the entire Great Depression, but it badly damaged confidence and reduced wealth. The Dow eventually reached a low in July 1932 and did not regain its September 1929 peak until 1954.