Which financier helped stabilize Wall Street during the Panic of 1907?

J. P. Morgan helped stabilize Wall Street during the Panic of 1907.

Morgan used his reputation, personal funds, and influence over banks and trust companies to organize emergency support. He reportedly gathered financial leaders in his library and pressed them to commit money to institutions whose failures could have spread through the banking system.

The panic began after a failed attempt to corner the stock of United Copper Company, but the crisis expanded as depositors withdrew money from trust companies. The Knickerbocker Trust Company failed, intensifying fear in New York. Morgan's interventions helped prevent a wider collapse, although they did not eliminate the economic damage.

The episode also exposed the weakness of the United States' banking structure. Congress later created the National Monetary Commission, and the Federal Reserve System was established in 1913, providing a permanent central banking framework.