The exchange suspends trading as war in Europe disrupts international financial markets.

On 31 July 1914, the New York Stock Exchange (NYSE) suspended trading as World War I began to disrupt international financial markets, marking one of the most significant interruptions in the Exchange's history. The closure followed escalating tensions in Europe after Austria-Hungary declared war on Serbia, triggering widespread uncertainty across global financial markets. As European investors sought to sell American securities and move their funds into gold, concerns grew over massive stock sell-offs, declining prices, and financial instability. To protect the American financial system and prevent panic selling, NYSE officials made the extraordinary decision to temporarily halt trading. This historic closure demonstrated the deep connections between American and European financial markets and the growing importance of the NYSE in the global economy. The 1914 closure became the longest trading suspension in NYSE history, lasting more than four months and highlighting the importance of financial stability during periods of global uncertainty. The Exchange gradually resumed operations, reopening for bond trading on 28 November 1914 and limited stock trading on 12 December 1914, with restrictions designed to maintain orderly markets. This historic event demonstrated the NYSE's ability to adapt to extraordinary international circumstances and reinforced the importance of coordinated financial management. The experience also influenced the development of modern market safeguards, including trading suspensions and mechanisms designed to maintain investor confidence during periods of extreme volatility.