For the next five years, Abdulaziz administered the two parts of his dual kingdom as separate units. On 23 September 1932, Abdulaziz proclaimed the union of the main Saudi dominions of al-Hasa, Qatif, Nejd and the Hejaz as the Kingdom of Saudi Arabia.
Foreign policy
The Kingdom of Hejaz and Nejd could pursue its expansionist policy with British arms supplies because of its close relations with the United Kingdom. Under King Abdulaziz, the Hejaz withdrew from the League of Nations.
^Joseph Kostiner. (1993). The Making of Saudi Arabia, 1916–1936: From Chieftaincy to Monarchical State. Oxford University Press US, ISBN0-19-507440-8, p. 104.