Due to the fact United States notes not served any purpose not already sufficiently satisfied by Federal Reserve notes, their issuance was discontinued and, starting in 1971, no new United States notes were being put into circulation. Congress authorizes a new class of currency, referred to as “United States notes,” https://ricardoqwxxy.ziblogs.com/28087124/questions-frequently-asked-at-the-us-embassy-an-overview