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The US dollar is the official currency of the United States of America . The current U.S. dollar bills in circulation are the various banknotes issued since 1929. Appeared after the passage of the United States Coinage Act of 1792. It is also widely used outside the United States as a reserve currency. The current issuance of U.S. dollars is controlled by the U.S. Federal Reserve System. Since 1913, the United States has established the Federal Reserve System and issued Federal Reserve Notes.