What was the great depression? when did it occur? what events caused it? when did it end?

The Great Depression was a severe worldwide economic depression that took place mostly during the 1930s, originating in the United States. The timing of the Great Depression varied across nations; in most countries it started in 1929 and lasted until 1941.[1] It was the longest, deepest, and most widespread depression of the 20th century.[2] In the 21st century, the Great Depression is commonly used as an example of how far the world's economy can decline.[3]