In 1941 , during the period leading up to the entry of the United States into World War II he helped write the Lend-Lease plan . Cohen also assisted in the drafting of the 1944 Dumbarton Oaks agreements leading to the establishment of the United Nations . In 1945 Cohen served as the United States ' chief draftsman at the Potsdam Conference
Potsdam Conference
Potsdam Conference
Benjamin V. Cohen