The Depression resulted in a sharp increase in Unemployment Rates.
The Depression of 1920-21 was a deflationary recession in the United States of America and other countries, that started several months after the end of World War I.
Among the causes, we can mention the return of the troops to civilian labor force, which led to unemployment and wage stagnation, a decline in agricultural commodity prices, tighter monetary policy and reduced investments, counting on a future deflation.