Though we know there was no one cause, what signaled the beginning of the Great Depression?

The Great Depression was a complex economic downturn that was caused by a combination of factors, including the stock market crash of 1929, high tariffs, and the failure of banks. However, the stock market crash of 1929 is often considered the event that signaled the beginning of the Great Depression. On October 29, 1929, known as Black Tuesday, the stock market experienced a sharp decline, which led to a loss of confidence in the economy and a subsequent economic downturn.