The Nazi Invasion of Amerika, 1942

LIFE Magazine published this article on the possibilities of the U.S. losing the war in their 2 March 1942 issue.  An interesting read with that period context, rather than it being an alternate history novel.

http://longstreet.typepad.com/thesciencebookstore/2009/12/mapping-the-invasion-of-america-1942.html
see also:
http://longstreet.typepad.com/thesciencebookstore/2010/12/jf-ptak-this-map-pretty-well-tells-the-story-of-the-perilous-situation-of-europe-and-england-at-the-beginning-of-june-19.html