<P> On June 4, 1963, Kennedy signed Public Law 88 - 36, which marked the beginning of the end for even the $1 silver certificate . The law authorized the Federal Reserve to issue $1 and $2 bills, and revoked the Silver Purchase Act of 1934, which authorized the Secretary of the Treasury to issue silver certificates (by now limited to the $1 denomination). Because it would be several months before the new $1 Federal Reserve Notes could enter circulation in quantity, there was a need to issue silver certificates in the interim . Because the Agricultural Adjustment Act of 1933 granted the right to issue silver certificates to the president, Kennedy issued Executive Order 11110 to delegate that authority to the Treasury Secretary during the transition . </P> <P> Silver certificates continued to be issued until late 1963, when the $1 Federal Reserve Note was released into circulation . For several years, existing silver certificates could be redeemed for silver, but this practice was halted on June 24, 1968 . </P> <P> Finally, President Richard Nixon announced that the United States would no longer redeem currency for gold or any other precious metal, forming the final step in abandoning the gold and silver standards . This announcement was part of the economic measures now known as the "Nixon Shock". </P> <P> Due to the monetary policy of the U.S. Federal Reserve, calls for a return to the gold standard have returned . Some states have chosen to use a loophole in the Federal Reserve act that gives individual states the right to issue currencies of gold or silver coins or rounds . This was done because the Federal Reserve Act does not allow them to print their own currency if they wished . As of January 2012, Utah allowed the payment of debt to be settled in silver and gold, and the value of the American silver or gold rounds used was pegged to the price of the given precious metal . Payment in some cases can be requested to be made in silver or gold rounds . As of 2011, eleven other U.S. states were exploring their options to possibly make similar changes like Utah . </P>

When did the united states go off the silver standard