When was ivory trade made illegal?

The US act that made Afican elephant ivory illegal was enacted on October 7, 1988.

"African elephant CONSERVATION ACT

16 U.S.C. 4201-4245, October 7, 1988, as amended 1992.

Overview. The purpose of the Act is to perpetuate healthy populations of African elephants. The Act authorizes financial assistance for African elephant conservation programs; requires review of these programs and establishment of moratoria on ivory import if specific criteria are not met; requires annual reports to Congress; creates

criminal and civil penalties for illegal ivory import or export; exempts sport-hunted elephant trophies; and allows for payment of rewards..."