The dollar is the legal tender of the United States of America. Dollar banknotes in circulation are all kinds of banknotes issued since 1929. The coinage method of 1792 came into being. At present, the issuance of dollars is controlled by the Federal Reserve. Starting from 19 13, the United States established the federal reserve system and issued federal reserve bonds. More than 99% of the cash is issued by the Federal Reserve.
The issuing authority of US dollars is Congress, and the specific issuing business is handled by the Federal Reserve Bank. After World War II, continental European countries reached an agreement with the United States to use US dollars for international payments. Since then, the dollar has been widely used as a reserve currency in countries outside the United States, and eventually became an international currency.