Alexander Hamilton helped stabilize markets during the Panic of 1792, the first major crash in American financial history.
The panic grew out of speculative trading in securities, including shares connected to the new United States government and the Bank of the United States. William Duer and other speculators borrowed heavily to buy securities, but falling prices made it difficult to repay loans. Defaults spread through financial markets in New York and Philadelphia.
As Treasury secretary, Hamilton responded with measures intended to restore confidence and liquidity. The Treasury bought government securities, and Hamilton encouraged banks to continue lending rather than abruptly calling in loans. His actions helped limit the damage and demonstrated the federal government’s role in supporting financial stability.
The panic did not involve a modern stock exchange in the same way as later crashes. Securities trading was conducted through informal markets before the New York Stock Exchange was established. The event is nevertheless regarded as an early U.S. financial crisis. Hamilton is the specific answer because he directed the government response.