The Great Depression lasted from 1929 to 1939 and was caused by the stock market crash of 1929. The crash sent panic on Wall Street and wiped out many investors. Over subsequent years, consumer spending and investment dropped sharply. By 1933 unemployment had reached about 25% and GDP dropped nearly 30%. The effects of the economic crisis were felt worldwide as other nations also experienced declines in production, falling prices, stock market collapses, rising unemployment, and increased bankruptcies. The Great Depression marked the worst economic downturn in modern history, with millions unemployed in the US and many living in poverty in shantytowns. The Depression ultimately ended during World War II as war spending revived the economy and reduced unemployment.