Final answer:
The beginning of the Great Depression was marked by the U.S. stock market collapse on Black Tuesday in 1929.
Explanation:
Black Tuesday on October 29, 1929, marked the beginning of the Great Depression as the U.S. stock market collapsed, leading to a chain reaction of financial turmoil and economic downturn.
This event resulted in a significant loss of wealth, triggered mass panic selling, and set off a series of bank failures, business closures, and widespread unemployment during the 1930s.
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