| Summary/Abstract |
During the 20th century, relations between the United States and China underwent major changes several times. They went from the United States' opposing Japanese aggression in China in the 1930s, based on the U.S.A.'s Open Door policy; to a close military and political alliance in the 1940s, including recognition of China as a great power; and finally, to refusing to recognize the People's Republic of China in the early 1950s and adopting a policy of containment and isolation. The dead end in relations between the two countries was opened by U.S. President Richard Nixon's visit to China in 1972 and the concurrent signing of the Shanghai Communique.
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