What really fueled the growth of the American economy after World War 2 to the early 1970s was: A. low-cost energy. B. the space programs. C. the interstate highway system. D. foreign trade alliances. E. the expansion of manufacturing jobs.The high inflation rate of the 1970s stemmed primarily from: A. the Middle East oil embargo. B. high taxes. C. deregulation policies to remove Roosevelt era regulations. D. spending on social-welfare programs and the Vietnam War. E massive investment and revitalization of major industry