Economic problems for many countries in Europe in the 1920's and 1930s were mainly caused by?

Economic problems in many European countries during the 1920s and 1930s were primarily caused by the aftereffects of World War I, including massive war debts and reparations. The global Great Depression, which began in 1929, exacerbated these issues, leading to high unemployment, deflation, and a decline in industrial production. Additionally, protectionist policies and unstable currencies further hindered economic recovery, creating widespread social and political unrest.