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The causes of the Great Depression are a matter of active debate among economists, and are part of the larger debate about economic crises, although the popular belief is that the Great Depression was caused by the crash of the stock market.
The Great Depression Facts. The Great Depression Facts. The Great Depression was a devastating financial crisis that affected most countries around the world. Although the Great Depression began in 1929 and lasted until the beginning of World War II, the worst years were between 1933 and 1934 in the United States. The stock market crash on Wall Street in October 1929 triggered the financial crisis and many investors lost everything.