It was the Khmer Republic from 1970 until 1975
[DOC] [TLE] Cambodian Genocide  World Without Genocide - Working to create ... [PAR] Power was given to Cambodia's Prince Sihanouk but in 1970, he was deposed in 
a military coup ... Lon Nol was made president of the new Khmer Republic while 
Prince Sihanouk and his loyal .... Minister of Social Affairs from 1975 until 1979.