 Lindbergh's [[Pulitzer Prize]]-winning biographer, [[A. Scott Berg]], contended that Lindbergh was not so much a supporter of the Nazi regime as someone so stubborn in his convictions and relatively inexperienced in political maneuvering that he easily allowed rivals to portray him as one.Lindbergh's receipt of the German medal was approved without objection by the American embassy; the war had not yet begun in Europe.The award did not cause controversy until the war began and Lindbergh returned to the United States in 1939 to spread his message of nonintervention.