The back story of 'Man in the High Castle' is really complex. After the Axis victory in WWII, life has changed drastically. The Nazis have their own brand of extreme ideology that they enforce on the people in their territory. The Japanese, on the other hand, have their own set of rules in the Pacific States. The characters in the story are often caught in the middle of this power struggle. There are underground movements trying to resist the oppressive regimes. And these alternate - history elements create a rich backdrop for the story. The idea of different versions of reality shown through the films in the show adds another layer to this already intricate back story, as it makes people question what could have been and what is real in this strange new world order.
The back story of 'Man in the High Castle' is set in an alternate history where the Axis powers won World War II. The United States is divided between the Greater Nazi Reich on the East Coast and the Japanese - controlled Pacific States on the West Coast. It shows a world full of oppression, where different cultures and ideologies clash. There are also elements of resistance against the totalitarian rule.