What year did Great Depression take place?
From October 1929 - late Thirties
1929-33. Sometimes it's considered to have continued until 1939 or 1941, but there were periods of recovery in 1933-37 and from 1938, with only a brief second downturn in 1937-38. An earlier Great Depression was a prolonged period of price deflation in 1873-96, but its effects on output and employment were far less pronounced.