This article examines American positions on the Internal Market Completion Program initiated in 1985 by the European Community. This eight-year program lasted until the end of 1992. The positions of experts, business representatives, the media, Congress and the administrations of Presidents Ronald Reagan and George H.W. Bush are presented. We discover the ignorance of the European project on the other side of the Atlantic until 1988, then the acute fear of the creation of a “Fortress Europe” and the major political change brought about by the arrival of George H.W. Bush at the head of the United States in January 1989. From a mainly economic perception, the emphasis shifted to the link between “Europe 1992” and the future of NATO. The American objective was to maintain the Atlantic Alliance and its integrated military structure, whatever the cost, despite the end of the Cold War.