The State of Aden ( Wilāyat ʿAdan) was a state constituted in Aden within the Federation of South Arabia. Following its establishment on 18 January 1963, Sir Charles Johnston stepped down as the last Governor of Aden. In spite of the hopes placed in the Federation, the insurgency in Aden escalated and hastened the end of British presence in the territory with the British leaving Aden by the end of November 1967. The State of Aden finally became part of the independent People's Democratic Republic of Yemen, also known as South Yemen, on 30 November 1967. History To solve many of the problems the Colony of Aden faced, as well as continuing the process of self-determination that was accompanying the dismantling of the British Empire, it was proposed that the Colony of Aden should form a federation with the protectorates of East and West Aden. Under this scheme it was hoped that the conditions would be created to lessen Arab calls for complete independence, while still allowing British control of foreign affairs and the BP refinery at Little Aden to continue. Federalism was first proposed by ministers from both the colony and protectorates: the suggested amalgamation would be beneficial, they argued, in terms of economics, race, religion and languages. However the step was illogical in terms of Arab Nationalism, for it was taken just prior to some impending elections, and was against the wishes of Aden Arabs, notably many of the trade unions. An additional problem was the huge disparity in political development, as at the time Aden colony was some way down the road to self-government and in the opinion of some dissidents, political fusion with the autocratic and backward Sultanates was a step in the wrong direction. In the federation, the former Aden Colony was to have 24 seats on the new council, while each of the eleven sultanates of the former Aden Protectorate was to have six. The federation as a whole would have financial and military aid from Britain. Aden Emergency Many of the problems that Aden had suffered in its time as a colony did not improve as a federated state. In the new federation the Aden Trade Union Congress (ATUC) had a large influence in the new assembly and to prevent it seizing control of the federation in 1962 the former Colony of Aden had joined the Federation of South Arabia so that Aden's