Here is a summary of ‘The Unnecessary War’ by Buchanan:
(It is about 10 pages long.)
It is well worth reading - the summary - if you are interested in the politics of WW2, however, it appears that the war is being analysed without much consideration being given to significant financial aspects.
Certainly it is a good start to some serious analysis, which has been slow to come from America. It opens the door for understanding how to avoid wars in the future.