Before the military defeat in Vietnam war, economic and social situation before the US decline and large pressure of the United States and of the world opposed the Vietnam war, the rulers of America found the balance of the world are these intromittent no good for America. The battlefield of America proved not enough to sustain the development of revolutionary and progressive forces in the world. So, the US strategic adjustment advocates attempting to continue a policy of global hegemony and maintain u.s. dominance in southern Vietnam by a new colonialism.
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