Black Monday refers to the stock market crash on October 19, 1987, when the Dow Jones Industrial Average (DJIA) plummeted 508 points, or 22.6%—the largest single-day percentage decline in history.
The Great Depression was a severe worldwide economic depression that took place during the 1930s, starting in the United States. The timing of the Great Depression varied across nations; in most countries, it started in 1929 and lasted until the late 1930s or early 1940s.
