The Association of Southeast Asian Nations (ASEAN) is Southeast Asia's primary multilateral organisation. Established in 1967, it has grown into one of the world's largest regional forum representing a strategically important group of 10 nations that spans critical sea lanes and accounts for 5% of U.S. trade. This book examines U.S. diplomatic, security, trade and aid ties with ASEAN, analyses major issues affecting Southeast Asian countries and U.S.-ASEAN relations, and explores ASEAN's relations with other regional powers with a focus on multilateral diplomacy.