When you get water from the tap or electricity from the wall outlet, you might very well be relying on FDR's projects. The nation's postwar boom actually began during World War II, because of the massive ramping up in federal employment and spending, which created a tremendous manufacturing base as well and within a few years growth overtook the federal deficit. Top tax rates in the 1950s under Eisenhower were over 90%. Unionization rates were extremely high. The GI Bill created a highly educated workforce. The Interstate Highway System created millions of jobs and served as the basis, for good and ill, of the future economy of the United States. Public colleges and universities were free of tuition for in-state students (this did not change until the late 1960s; in August, 1967 (I was looking for an account of Ryun's Dusseldorf race), Ronald Reagan proposed having tuition ($250) for in-state students at U.C. Berkeley for the first time in its 100 years. American high schools were starting to become the envy of the world and by the early 1960s, SAT's would be the highest in American history to the present and our science and technology people were making radical advances in every field. Regulation was still heavy from WWII and the Depression. And inequality was very low because of unionization, good jobs, low foreign competition, and a low multiplier from average worker pay to CEO pay.