The author of this article has analyzed the diaries of Jan Szembek, Polands Deputy Foreign Minister and the 1937–1939 reports from Warsaws of the U.S Ambassador to Poland, A.J.Drexel-Biddle. Basing on this material, the author concludes that the Polish–U.S. relations in that period were rather shallow, and were mostly restricted to Warsaws informing Washington about the growing military threat posed by nazi Germany. This state of things stemmed from the fact that, consistent with principle of isolationism, Franklin D.Roosevelt and the State Department were not ready, prior to 1939, to pledge any support for Europe, and for East-Central Europe in particular.