His successor, Mohammad Reza Pahlavi, announced in 1959 that both Persia and Iran were acceptable and could be used interchangeably.Rezā Shāh tried to avoid involvement with the UK and the Soviet Union. Though many of his development projects required foreign technical expertise, he avoided awarding contracts to British and Soviet companies due to dissatisfaction during the Qajar Dynasty between Persia, the UK, and the Soviets.