Japan-US alliance stems from a special location in Japan, the Japanese archipelago is located in the Pacific Ocean on the east coast of the Asian continent, in the eyes of Western scholars, guardian of the important passage to the Pacific, Northeast Asia continental power against a continental power eastward expansion the bridgehead.
Modern geopolitical island of Kyushu, Japan, the Ryukyu Islands are part of the first island chain, its Hokkaido, Honshu Island, Ogasawara Islands is part of the second island chain. Therefore, a "pawn" as crucial to the Western Pacific region, Japan naturally become the focus of national land power and sea power in the western Pacific confrontation.
 
Since the Meiji Restoration, Japan from Asia for Europe "strategic orientation of the aggressive nature caused tension with neighboring Asian countries, long-term geopolitical relations, and Japan tend to extraterritorial powers alliance. Modern, Japan has concluded the Anglo-Japanese Alliance and the Russo-Japanese treaty and Germany, Italy, Japan alliance. The common feature of the three allied with the powers of Europe and the United States alliance with the enemy of the Asian countries.
 
East Asian geopolitical environment, Japan's geostrategic orientation, structural deficiencies of the national power of Japan and Japanese culture pro-European and American tendencies, and a variety of factors, so that the country of Japan to become Asia's most the foreign alliance "Preferences". The remains date from the end of World War II Japan-US alliance, but also the continuation of this political tradition.
Manifestation of the importance of the U.S. strategic position in Japan began in the Cold War, especially the outbreak of the Korean War, and highlights the supporting role of Japan in the Asia-Pacific region, the U.S. global strategy. Japan for the reconstruction of the need to identify themselves "pro-US" strategic orientation. In 1951, the United States and Japan signed the Japan-US Security Treaty, this opened the prelude of the Japan-US alliance. The United States has not only assumed the security and defense of Japan, is as important a wing of the socialist camp against the Soviet Union in the Asian region.
 
January 19, 1960, the United States and Japan re-signed the Japan-US co-operation with the safety and security of the Treaty, the the Japanese status was lifted to "alliance" to start sharing the responsibility of the defense of the United States in the Asia-Pacific region, the two countries formally join forces against the Soviet Union. Positioning in Japan is becoming clear by the initial passive rely on the United States gradually to take the initiative to take refuge in the United States shift, and even proposed to act as the Western Pacific, "the anti-communist breakwater. Early 1980s further raised to become the "unsinkable aircraft carrier" to prevent the Soviet Union, the west Pacific expansion.
 
After the collapse of the Soviet Union, the Japan-US alliance relationship once into the "drifting" status. But in the latter half of the 90s of the last century, in the face of China's rapid development, the two countries again find a common goal - to contain China. April 17, 1996, the United States and Japan signed the Japan-US Joint Declaration on Security, clear the new role of the Japan-US alliance is the common defense of Japan and to cope with the surrounding situation in Japan.
As can be seen from the history of the Japan-US alliance formation, this alliance is built on a solid two-way demand on the basis of two countries belong to the mutual use of the Community. In the current reality, this need is even more strongly.



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