At the end of 1944 , Clayton was named the first Assistant Secretary of State for Economic Affairs , a post that allowed him to promote the free trade policies that he believed in . He was a member of the Interim Committee appointed to advise Secretary of War Henry L. Stimson and President Harry S. Truman on problems expected to arise from the development of the atomic bomb and he was an economic advisor to Truman at the Potsdam Conference
Potsdam Conference
Potsdam Conference
William L. Clayton