I think it was Truman. FDR instituted some quick fixes that turned out to be not so quick until the increased production triggered by WWII finally jump-started them. In doing so, he dramatically increased federal expenditures. I believe that when things began to improve in the late 1940s and early 1950s, Truman had a responsibility to cut back on government spending and let the private sector thrive in the new-found prosperity. Instead, he kept all of the programs that had been intended to provide temporary jobs while people got back on their feet and therefore set a precedent concerning government growth and expenditures. Then, he went to war with North Korea, appointed a general who had already been proven incompetent and blood-thirsty during World War II, won the war but fired said general, then watched helplessly as said general went rogue and tried to start a war with China. In a last-ditch diplomatic effort, Truman erased everything our soldiers had done in Korea and authorized the creation of the DMZ, thereby destroying any post-war economic benefit we might otherwise have gained. Every president and Congress since WWII has followed the precedent set by Truman and driven us deeper into debt while taxes and inflation continue to increase.