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Although they are still technically legal tender in the United States, high-denomination bills were last printed in 1945 and officially discontinued on July 14, 1969, by the Federal Reserve System. The $5,000 and $10,000 effectively disappeared well before then: there are only about 200 $5,000 and 300 $10,000 bills known, of all series since 1861.
Circulation of high-denomination bills was halted in 1969 by executive order of President Richard Nixon, in an effort to combat organized crime.