What was the name of the sharp U.S. market fall on October 28, 1929?

The sharp U.S. market fall on October 28, 1929, was called Black Monday.

The Dow Jones Industrial Average fell 38.33 points, or about 12.8 percent, on that Monday. The decline followed heavy selling and came after the market had already dropped sharply on Black Thursday, October 24. The next day, October 29, brought another severe fall and became known as Black Tuesday.

These consecutive sessions were part of the Wall Street Crash of 1929, which marked the collapse of a highly speculative stock-market boom. Investors had bought shares with borrowed money, making forced selling especially destructive when prices turned downward.

Black Monday in 1929 is often confused with October 19, 1987, which is also widely called Black Monday. The dates and economic settings are different: 1929 preceded the Great Depression, while 1987 was a later, internationally synchronized market crash without an equivalent decade-long depression.