The Great Depression was a severe worldwide economic depression that took place mostly during the 1930s, beginning in the United States. The timing of the Great Depression varied across the world; in most countries, it started in 1929 and lasted until the late 1930s. It was the longest, deepest, and most widespread depression of the 20th century.
Several factors contributed to the Great Depression, including stock market crash, bank failures, reduction in purchasing across the board, American economic policy with Europe, and drought conditions.
The Great Depression had devastating effects in both rich and poor countries. Personal income, tax revenue, profits, and prices dropped, while international trade plummeted by more than 50%. Unemployment in the U.S. rose to 25% and in some countries, it rose as high as 33%.