The U.S.-Japan alliance is a strategic partnership between the United States and Japan that began after World War II. It was formalized in 1960 with the U.S.-Japan Security Treaty, which allows the U.S. to maintain military bases in Japan and commits both nations to mutual defense. This alliance plays a crucial role in maintaining stability in the Asia-Pacific region. The alliance is not only military but also economic, fostering strong trade relations and cooperation in technology and innovation. Both countries work together on various global issues, including climate change, counterterrorism, and disaster response, highlighting their commitment to shared democratic values and regional security.