The Federal Reserve Act of 1913 authorized the production and circulation of Federal Reserve notes. Although the Bureau of Engraving and Printing (BEP) prints these notes, they move into circulation through the Federal Reserve System. They are obligations of both the Federal Reserve System and the United States Government. On Federal Reserve notes, the seals and serial numbers appear in green.
United States notes serve no function that is not already adequately served by Federal Reserve notes. As a result, the Treasury Department stopped issuing United States notes, and none have been placed into circulation since January 21, 1971.