Which date marked the 1929 Wall Street Crash's biggest one-day point loss in the Dow?

October 28, 1929, marked the 1929 Wall Street Crash's biggest one-day point loss in the Dow.

The Dow Jones Industrial Average fell 38.33 points, or 12.8%, on October 28. The following day, October 29, brought another major decline of 30.57 points, or 11.7%, and became known as Black Tuesday. The preceding Thursday, October 24, is remembered as Black Thursday.

The sequence shows why the crash cannot be reduced to one isolated trading session. Heavy selling, margin calls, weakening confidence, and concerns about the economy produced repeated waves of pressure. The Dow had reached a record high only weeks earlier, on September 3.

The 1929 crash was followed by a prolonged bear market. The Dow eventually reached its low in July 1932, after which the economic crisis continued even as stock prices began recovering.