Abstract: Why has the Association of Southeast Asian Nations (ASEAN) proved so durable as a regional organisation given the many challenges it has faced since its inception in 1967? This analysis makes use of an historical institutionalist approach. It shows how the global political economy, through the injection of aid and investment and the development of production networks and increased trade, generated a generally positive regional economic environment that encouraged cooperation. It also provided the resources for the gradual institutionalisation of ASEAN and the expansion of its reach through the establishment of associated regional organisations. The result was that these factors, in combination, contributed to ASEAN’s staying power.