没有永远的朋友,也没有永远的敌人,只有至高无上的国家利益。这是美国制定各种对外政策的原则。近代以来,美国在不同时期制定了各种对华政策,也是以维护和扩大其在华利益为主导原则的。 1840年以后,当英、法、俄、日等帝国主义使拥有独立主权的,封建落后的中国逐步沦为半殂民地国家的过程中,美国也扮演了一个重要的丑角。如强迫中国签订《中美 There is no friend forever, no enemy forever, only the supreme national interest. This is the principle that the United States has made in various foreign policies. Since the modern era, the United States has enacted various policies toward China in different periods and has also taken the principle of safeguarding and expanding its interest in China. After 1840, when imperialism such as Britain, France, Russia and Japan reduced the feudal and backward China with independent sovereignty to a semi-permanent land, the United States also played an important harlequin. Forcing China to Sign "China and the United States