By almost any criterion of success—be it cost-effectiveness, risk-reward ratio, multiplier
effects, or sheer longevity, the Japan America Security Alliance (JASA) stands out as one of
the most successful alliances in twentieth century history. For the United States, chief
architect of a global network of military relationships, JASA is arguably the most important
of its many bilateral alliances. In terms of historic impact, JASA is comparable to the North
Atlantic Treaty Organization (NATO), a multilateral alliance that restructured the European
security landscape in 1949. For nearly a half-century, JASA and NATO have functioned
as the bedrock on which the Cold War security systems of Asia and Europe have been
constructed.

Published as part of the "America's Alliances with Japan and Korea in a Changing Northeast Asia" Research Project.