What American entity has the most influence over the international banking system?

The Federal Reserve, the central banking system of the United States, has the most influence over the international banking system. Its monetary policy decisions, interest rate adjustments, and regulatory actions can significantly impact global financial markets and economies. Additionally, the U.S. dollar's status as the world's primary reserve currency further amplifies the Fed's influence on international banking and trade. This interconnectedness means that changes in U.S. economic policy can have far-reaching effects worldwide.