On 29 October 1942, Hitler read Hedin's book entitled, America in the Battle of the Continents. In the book Hedin promoted the view that President Roosevelt was responsible for the outbreak of war in 1939 and that Hitler had done everything in his power to prevent war. Moreover, Hedin argued that the origins of the Second World War lay not in German belligerence but in the Treaty of Versailles. This book deeply influenced Hitler and reaffirmed his views on the origins of the war and who was responsible for it. In a letter to Hedin the following day Hitler wrote, "I thank you warmly for the attention you have shown me. I have already read the book and welcome in particular that you so explicitly detailed the offers I made to Poland at the beginning of the War". Hitler continued, "without question, the individual guilty of this war, as you correctly state at the end of your book, is exclusively the American President Roosevelt."