The United States experienced the stock market crash in 1929, specifically on October 29, a day that came to be known as "Black Tuesday." This catastrophic event marked the beginning of a significant economic downturn that laid the groundwork for the Great Depression, leading to widespread unemployment, bank failures, and economic instability throughout the 1930s. The crash highlighted the vulnerabilities in the financial system and was a key factor in changing government policies toward economic regulation and oversight.