The stock market crash that led to the Great Depression occurred in 1929, with the most significant event being Black Tuesday on October 29. This crash resulted in widespread economic turmoil, leading to bank failures, massive unemployment, and a profound loss of confidence in the financial systems. The consequences of the crash rippled across the globe, affecting economies for years to come, and it set the stage for the major reforms and policies introduced during the New Deal in the 1930s.