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Founding

The predecessor of ASEAN was the Association of Southeast Asia (ASA), formed on 31 July 1961 and consisting of Thailand, the Philippines, and Malaya. ASEAN itself was created on 8 August 1967, when the foreign ministers of five countries— Indonesia, Malaysia, the Philippines, Singapore, and Thailand —signed the ASEAN Declaration. According to the Declaration, ASEAN aims to accelerate economic, social, and cultural development in the region, as well as promoting regional peace, to collaborate on matters of shared interest, and to promote Southeast Asian studies and maintain close cooperation with existing international organisations.

The creation of ASEAN was initially motivated by the desire to contain communism, which had taken a foothold in mainland Asia after World War II, with the formation of communist governments in North Korea, China, and Vietnam, accompanied by the so-called communist "emergency" in British Malaya, and unrest in the recently decolonized Philippines.

These events also encouraged the earlier formation of the South East Asia Treaty Organization (SEATO), led by the United States, United Kingdom, and Australia, with several Southeast Asian partners in 1954 as an extension of "containment" policy, seeking to create an Eastern version of NATO. However, the local member states of ASEAN group achieved greater cohesion in the mid-1970s following a change in the balance of power after the fall of Saigon and the end of the Vietnam War in April 1975 and the decline of SEATO.

ASEAN's first summit meeting, held in Bali, Indonesia, in 1976, resulted in an agreement on several industrial projects and the signing of a Treaty of Amity and Cooperation, and a Declaration of Concord. The end of the Cold War allowed ASEAN countries to exercise greater political independence in the region, and in the 1990s, ASEAN emerged as a leading voice on regional trade and security issues.

On 15 December 1995, the Southeast Asian Nuclear-Weapon-Free Zone Treaty was signed to turn Southeast Asia into a nuclear-weapon-free zone. The treaty took effect on 28 March 1997 after all but one of the member states had ratified it. It became fully effective on 21 June 2001 after the Philippines ratified it, effectively banning all nuclear weapons in the region.