The event that catalyzed the stock market crash in 1929 was Black Tuesday, which occurred on October 29. Leading up to this date, speculation and excessive investment in the stock market led to an economic bubble that burst. On Black Tuesday, a massive sell-off occurred, resulting in a drastic decline in stock prices, which wiped out millions in wealth. This crash was symptomatic of broader economic instability, resulting in the Great Depression that severely affected economies worldwide. The crash eroded public confidence, leading to bank failures, business closures, and widespread unemployment, fundamentally reshaping economic policies and systems in subsequent years.