Which U.S. financial institution's collapse helped trigger the Panic of 1873?

The collapse of Jay Cooke & Company helped trigger the Panic of 1873. The Philadelphia-based investment bank failed on September 18, 1873, after it could not sell enough Northern Pacific Railway bonds.

Jay Cooke had financed Union government borrowing during the Civil War and later invested heavily in railroads. The Northern Pacific project required enormous capital, and doubts about its prospects made the bonds difficult to place. When the firm suspended payments, fear spread through financial markets and contributed to the closure of the New York Stock Exchange for ten days.

The panic was part of a broader international downturn rather than the result of one institution alone. Railroad overbuilding, speculative finance, falling commodity prices, and banking stress all mattered. In the United States, the resulting Long Depression lasted for years, although historians debate its exact endpoint and whether the whole period should be called a depression.