when did the us dollar become reserve currency
Reserve currency After World War II, the international financial system was governed by a formal agreement, the Bretton Woods System. Under this system the United States dollar was placed deliberately as the anchor of the system, with the US government guaranteeing other central banks that they could sell their US dollar reserves at a fixed rate for gold.[8]
Large denominations of United States currency Large denominations of United States currency greater than $100 were circulated by the United States Treasury until 1969. Since then, U.S. dollar banknotes have only been issued in seven denominations: $1, $2, $5, $10, $20, $50, and $100.