Normal diplomatic relations were reestablished in 1952, when the Supreme Commander for the Allied Powers, which had overseen the postwar Allied occupation of Japan since 1945, disbanded. The Treaty of Mutual Cooperation and Security between Japan and the United States was signed in 1960.
The U.S.-Japan Alliance was strengthened in 2015 through the release of the revised U.S.-Japan Defense Guidelines, which provide for new and expanded forms of security-oriented cooperation. Japan provides bases as well as financial and material support to U.S. forward-deployed forces, which are essential for maintaining stability in the region. In January 2016 the United States and Japan signed a new five-year package of host nation support for U.S. forces in Japan.
U.S. economic policy toward Japan seeks to expand access to Japan's markets, increase two-way investment, stimulate domestic demand-led economic growth, promote economic restructuring, improve the climate for U.S. investors, and raise the standard of living in both countries. The U.S.-Japan bilateral economic relationship, which is anchored in enormous flows of trade and investment, is strong, mature, and increasingly interdependent.
Japan and the United States belong to a number of the same international organizations, including the United Nations, G7, G-20, Organization for Economic Cooperation and Development, Asia-Pacific Economic Cooperation forum, ASEAN Regional Forum, International Monetary Fund, World Bank, and World Trade Organization. Japan is also a Partner for Cooperation with the Organization for Security and Cooperation in Europe and an observer to the Organization of American States.