Every administration since Kennedy has been cutting the funding for NASA. Especially Reagan in his effort to outspend the Russians on nukes and bankrupt our economy. Even Clinton(the bastard) cut funding for NASA. So did Bush the first as well as he and Barbara's retarded monkey child.
Shortly after the Apollo program was over some idiot decided to destroy the molds/dies and what have you for the Saturn 5 rocket. The cost in today's money to build another one would be horrendous which is one of the main reasons that NASA moved their focus to orbital activities like the ISS and the shuttle program.