With all due respect to Truman's cousin, Truman made a mess of things. He created the UN, designing it with complete naivitee. He got us in the Korea quagmire and put MacArthur on such a short leash MacArthur could not conceive of how to win the war and follow Truman's directives at the same time, he proliferated nuclear weapons with his silly 'atoms for peace' project, and he allowed actual, official socialists to be hired in the executive branch by the thousands. Yes, he dropped the bomb on Japan and ended the war. Yes, he bailed out the rest of the world with the Marshall Plan. Both achievements are constroversial, but well, I'm trying to say something nice here.