If you're looking for dates of the Great Depression in the United States, it occurred from
1929 to 1939
Details:
There was much speculative buying on the stock market in "the Roaring '20s." The stock market got inflated by people buying stocks "on margin." That meant they paid for a very small (marginal) percentage of the stocks with their own funds, and borrowed bank funds for the rest of the purchase. Banks were allowing these risky loans. By the late 1920s, 90% of the purchase price of stocks was being made with borrowed money.
In October, 1929, the market crashed, and the Great Depression followed. The Dust Bowl of the 1930s -- severe drought in farmlands in the center of the country -- worsened the crisis of the Depression.
President Franklin Delano Roosevelt introduced "New Deal" programs to try to pull the country out of the Depression. The programs were successful to a point. Ramping up industrial production for World War II had an even larger impact on improving the American economy. At first the USA was supplying Britain in their war effort, and in the early 1940s the USA entered the war also.