Back in the 60’s I remember an edition of Life or Look (my parents took both) had an article about a half-baked plan to divide America in the case of a German and Japanese victory. Basically, the Rockies and points west went to Japan and everything east to Germany. I’m not sure it was based on anything more than a fantasy map someone found, but I’ve never been able as an adult to find a copy of the article.
There’s this:
http://militaryhistorynow.com/2012/11/05/invasion-u-s-a-the-various-plans-to-conquer-america/
I remember seeing an early 1940’s copy of the Saturday Evening Post for sale at an used book store about ten years ago.
The magazine had a story about what a Nazi air raid over Detroit, Michigan would look like.
Large colored drawings showed factories and residential neighborhoods in flames.
At the time, my father’s side of the family lived there. I wondered if they had seen the magazine during World War II. It probably would have scared the bejesus out of them.
I remember reading that article too. As I recall, the Nazis sneakily planned on taking over the Japanese part of the American West after the takeover.