To the Editors: Geoffrey Wheatcroft is twice mistaken in stating that Americans “were resolutely united in their determination to have nothing to do with resisting Hitler, not only in September 1939 and June 1940 but until December 1941, when Hitler left them no choice by declaring war on the United States.” Instead, amid intense and often bitter debate, America abandoned its isolationism in favor of extensive aid to Hitler’s foes.