The majority of SEATO members were not located in Southeast Asia. To Australia and New Zealand, SEATO was seen as a more satisfying organization than ANZUS – a collective defense organization with the U.S.[20] The United Kingdom and France joined partly due to having long maintained colonies in the region, and partly due to concerns over developments in Indochina. Last but not least, the U.S. upon perceiving Southeast Asia to be a pivotal frontier for Cold War geopolitics saw the establishment of SEATO as essential to its Cold War containment policy.[2]