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In international relations, neither there are eternal friends nor foes; the only thing which remains eternal, is the national interest of nation-states, pursued to serve under circumstances and changing orders. This paper is an attempt to highlight in detail the nature of relationship between US and Pakistan under President General Ayub Khan (1958 to 1969) and under the framework of foreign policy analysis as well as core-periphery bilateralism of the hey-day of the bloc politics and its impact on South Asia. An Attempt will also be made to highlight and critically examine the relationship under the characteristics of US-Pakistan relationship and the major factors which have been accountable for the close security and economic alignment between the two countries over the said period and the aid Pakistan received from the US under the Foreign Assistance Act 1961 and its implications for South Asia. Research efforts will be made to highlight the nature of relationship under the core-periphery relationship with a special focus on the characteristics of US-Pakistan relationship which in large have been dependent and of asymmetrical nature.