The attack of the Japanese navy on Pearl Harbor and the United States' declaration of war on Germany and Japan altered the rivalry between Hoover and Roosevelt. An ardent patriot, Hoover supported the president in his efforts to control the economy and marshal supplies to win the war. He had done the same for Wilson and he would not change his position because of his personal distrust of Roosevelt.
Hoover devoted himself to the eventual end of the war. In their 1942 book, The Problems of Lasting Peace, Hoover and co-author Hugh Gibson developed many of the principles that would be incorporated into the charter of the United Nations. The positive response to the book also led a number of Americans to suggest that Roosevelt ask Hoover once again to become famine relief administrator.
Roosevelt would have none of that. In fact, he set James Rowe and Robert Patterson on a mission to discredit Hoover. Using confidential documents from the papers of Edward House at Yale University, Patterson claimed that Hoover had advocated shipping food supplies rather than troops during the first war. The report was leaked to Vice President Henry Wallace and Senator Theodore Green, who lambasted Hoover. The documents, however, were misdated and the claims were false.
Hoover was livid at this latest "dirty trick" from Roosevelt's henchmen. Through Perrin Galpin, Hoover pestered both Yale and the War Department for the names of those involved. It would finally take a letter of apology from