In over one century after the independence of America ,America had been carrying out the isolationism foreign poli-cy .But with the completion of westward movement and the realization of industrialization by the end of 19th century ,a new ex-pansionism theory new mani f est destiny came into being in order to hunt for the impetus of further development ,and solve the contradiction between the limited domestic market and developing productivity .The theory of new manifest destiny is a compli-cated system ,mainly including ethic superiority theory ,social Darwinism and the legitimate power over ...
