Ever since Heraklites' dictum “panta rhei,” historians have debated the relative priority of continuity and change. Although Nazi and Allied propagandists saw the Third Reich as the fulfillment of earlier traditions, postwar scholars stressed the unprecedented nature of its genocide, political repression, and external aggression. Sensitive to charges of “collective guilt,” many German historians preferred to see the Nazi era as something sui generis, an aberration from and not the culmination of German history. Handicapped by language, culture, and access to sources, American scholars often tended to concentrate on problems and themes within one of several airtight compartments such as the Wilhelmian Empire, Weimar Republic, or Third Reich. Because of efforts to restore the “historical consciousness of [the German] people,” the critical implications of Ludwig Dehio's and Hajo Holborn's revisionism were largely ignored. Hence the scholarly community reacted with anger and disbelief when Fritz Fischer drew attention first to the continuity of German expansionism and then to the continuity of historical apologetics in his provocative book on German Aims in the First World War.