Reza Shah attempted to attenuate the power of the colonial forces in Iran, and was successful to a large extent. However, he also needed them to help modernize the country. He did so by balancing the influence of various colonial powers, including that of Britain and Germany.v In the 1930s, Reza Shah tried to terminate the APOC concession that the Qajar dynasty had granted, but Iran was still weak and Britain would not allow it. The concession was renegotiated on terms again favorable to the British (although the D'Arcy Concession was softened). On 21 March 1935, Reza Shah changed the name of the country from Persia to Iran. The Anglo-Persian Oil Company was then renamed the Anglo-Iranian Oil Company (AIOC).