Coincidentally, WW2 cost America three trillion dollars (adjusted). Now, some people might argue that we had a much larger force, more theatres, and that that war was actually necessary, but John Boehner wouldn't! He'd tell us that this is just one more reason why we need to stay in Iraq forever.
Of course, there was corruption in WW2 spending. The difference there was that Harry Truman was given an important sub-committee in the Senate to investigate it. Can anybody imagine this "conservative" president appointing one of the "conservative" senators from his party to reign in some of this spending?