Britain was granted a Mandate for Palestine on 25 April 1920 at the San Remo Conference, and, on 24 July 1922, this mandate was approved by the League of Nations. Palestine became the British Mandate of Palestine and was placed under direct British administration. The Jewish population of Palestine which numbered less than 8 percent in 1918 was given free rein to immigrate, buy land from absentee landlords, set up a shadow government in waiting and establish the nucleus of a state under the protection of the British Army which suppressed a Palestinian revolt in 1936. The Territory East of the Jordan River was added to the British Mandate by the Transjordan Memorandum, which was a British memorandum passed by the Council of the League of Nations on 16 September 1922. Most of the Arabian peninsula fell to another British ally, Ibn Saud. Saud created the Kingdom of Saudi Arabia in 1932.