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South Asia has always been regarded as a significant area for the security interests of the United States. In view of the U.S. threat perceptions in Asia, the American policy makers were constantly motivated to construct a stable security system in the region. The U.S. security programme in South Asia actually is predominantly exerted on United States-Pakistan –India triangular relationship. Given its strategic perspective in the area, the U.S. policy is found transferred. During the Cold War days, the U.S. interests were attached with Pakistan. Thus Pakistan was regarded as the „America‟s most allied ally in Asia.‟ With the end of Cold War, the U.S. policy underwent a tremendous change that subsequently picked India as a potential counterweight to China and called it a „natural partner.‟ Eventually, the U.S.-Pakistan relations had been in a depressing setting. However, in the post 9/11 period, the two countries came closer and collaborated in war against terrorism. But this single-issue alliance could not engulf the differences between the partners. This paper attempts to trace the US security policy and its maneuvering in South Asia during and after the Cold War periods