Thousands starved or died of disease during the evacuation and its aftermath. Within the CPK , the paris educated leadership- Pol Pot,Ieng Sary, Nuan Chea, and Son Sen -were in control. A new constitution was adopted in Jan. 1976, establishing Democratic Kampuchea as a Communist People's Republic , and a 250-member assembly of the representativesof the people of Kampuchea (PRA)was selected in March to choose the collective leadership of a state presidium,the chairman of which became the head of state. prince Sihanouk resigned and was practicallyremained under house arrest.Pol pot became the Prime Minister and state presidium was also selected.
Life in democratic Kampuchea was strict and brytal, even crying for dead loved was not allowed. Estimates of the number of deads between 1975-1979 wee not available. Some estimate s gave figures of dead from 1 to 3 million out of a population of 7.3 million in 1975. CIA estimated that 50,000-1,00,000 were executed and 1.2 million died from 1975-1979.
Democratic Kampuchea's relations with Vietnam and Thailand worsened rapidly as a result of border disputes and ideological differences. they established ties with People's Republic of China. the reasons for Chinese support of the CPK was to prevent a pan-Indochina movement and maintain Chinese military supremacy in the region