The document summarizes the key events and causes of the Great Depression that began with the stock market crash of 1929 in the United States. It discusses how problems in important industries like agriculture, railroads and housing contributed to economic troubles in the late 1920s. After Republican Herbert Hoover was elected in 1928, the stock market crashed on Black Tuesday in October 1929, wiping out billions in wealth. The crash led to widespread bank failures and mass unemployment that peaked at 25% in 1933, plunging the US economy into the Great Depression. International trade also declined sharply during this period.