The World War II (1939 -1945) is the result of solving the confrontation between the Allied and Axis powers through military power. AndAt the end of the war is the, atomic weapons were used against Japan in August 1945, which came to shape of the emerging post-war orders. This also started the transition in the structure of the regional order through defeat of Japan and the start of decolonization, the US’sUS use of nuclear weaponweapons, and its Occupationoccupation of Japan from 1945 to 1952. After that, Japan and the US started to establish thea strong relationship in politics, economics, and security through the San Francisco Peace Treaty and Japan – US securitySecurity Treaty, and both of them came ininto force in 1952. According to the Treaty, the US, in the interest of peace and security, is presently willing to maintain certain of its armed forces in and about Japan, in the expectation, “For“for the purpose of contributing to the security of Japan and the maintenance of international peace and security in the Far East, the United States of America is granted the use by its land, air, and naval forces of facilities and areas in Japan” (Article VI, Japan-US Security Treaty).