On October 19, 1987, global stock markets crashed, with the U.S. stock market (Dow Jones Industrial Average) losing over 22% of its value in a single day. The crash, known as Black Monday, was caused by a combination of factors including high stock valuations, automated trading systems, and market panic. The crash led to a severe economic downturn and financial losses for millions of investors. Despite the severity of the crash, the economic impact was not as long-lasting as many had feared. Black Monday remains one of the most significant financial events in modern history.