The U.S. stock market crashed in **1929**, leading to the Great Depression. This event, known as Black Tuesday, occurred on October 29 when stock prices plummeted, wiping out millions of investors. The crash marked the beginning of a decade-long economic downturn that severely affected the U.S. and global economies. Widespread unemployment, bank failures, and poverty characterized this period, leading to significant social and political changes. The Great Depression prompted reforms in government policies and economic systems as nations sought to recover and prevent future financial crises.