Quoc: The Wall Street Crash of 1929, also known as Black Tuesday (October 29), the Great Crash, or the Stock Market Crash of 1929, began on October 24, 1929 ("Black Thursday"), and was the most devastating stock market crash in the history of the United States (acting as the most significant predicting indicator of the Great Depression), when taking into consideration the full extent and duration of its after effects. The crash, which followed the London Stock Exchange's crash of September, signalled the beginning of the 12-year Great Depression that affected all Western industrialized countries.

Answer this question based on the passage: when was black tuesday and what happened on that date?
HW Chung: OK, some thoughts:
To answer the above question, the relevant sentence is: The Wall Street Crash of 1929, also known as Black Tuesday (October 29), the Great Crash, or the Stock Market Crash of 1929, began on October 24, 1929 ("Black Thursday"), and was the most devastating stock market crash in the history of the United States (acting as the most significant predicting indicator of the Great Depression), when taking into consideration the full extent and duration of its after effects. The answer is the most devastating stock market crash in the history of the United States.