2. external factors a. the detente of the superpowers confrontation; the US taking uphand slightly b. reduction of URRS' s military threat to china C. a need for a peaceful external environment for china to ta ke nationwide economic reconstruction2. external factors a. the detente of the superpowers’ confrontation; the US taking uphand slightly b. reduction of URRS’s military threat to China c. a need for a peaceful external environment for China to take nationwide economic reconstruction