There are a number of books, movies or films that influenced The Old Blood & The New Order, but one story in particular seems to have had the greatest impact on Machine Game's new Wolfenstein universe. The Man in the High Castle was a alternate history novel by Philip K. Dick, in which The Allies lost WW2, and United States was captured by the Axis powers.
Philip K. Dick places the key event that changed history around the assassination attempt on Franklin D. Roosevelt by Giuseppe Zangara (February 15, 1933), which leads to a series of weaker presidents taking over. The lead to the US remaining largely isolationist for much of the war, leading to its capture later.
The Old Blood/New Order assumes that Franklin D. Roosevelt was the president at least into the early 1940s (as per cut-scenes in Spear of Destiny/Original Encounter, photos in Return to Castle Wolfenstein, etc), and possibly all the way to the end of his 4th term in early 1948 (assuming he didn't die earlier due to his health issues). There is no indication that he lived through his 4th term, or even won a 5th term, or if the Nazis would have encountered his replacement instead (if he had survived into his 4th term, the next president having been sworn in in January, 1948, and Germans take over in December, 1948. The New Order and Old Blood do not even indicate who was president at the time of those games (only referring to "The President").
- In both timelines due to weaknesses in the Allies, and advancements in German technology, the Germans become superior force. In Dick's novel, they take too much time, and never built up a force to take on the Germans, while in Machine Game's story, the Germans advance due to discoveries of advanced technology both supernatural and scientific.
- In the next 15-20 or so years following the war in both stories, the Nazis have time to progress technology further, going as far to colonize the moon. In Dick's story they have progressed beyond the moon, to colonize Venus and Mars. In New Order, the Nazis have gone as far as the moon, but are preparing a mission to colonize mars.
- In both stories Nazis finish the race to nuclear weapons and use these to help conquer the United States.
- The Nazis have captured most of Europe, there are very few 'neutral' powers left, and no more axis powers. In New Order, they have captured all or most of Europe, any 'neutral' powers are more proxy puppet governments setup by the Nazis.
- The Nazis are still trying to conquer Africa, and genocide and resistance is very high in both stories.
- Jews are thought to have been eradicated in both universes (or at least survivors held in prison camps on the remote regions of the empire). However, other surviving Jews maybe hiding amongst the Germans under their noses (and possibly even holding positions of power, this is more obvious in Dick's universe).
- Germans-Japanese forces lead to the destruction of the Allied forces.
- Hitler due to his deteriorating mental health becomes more of a puppet. He is still alive in Phillip K. Dick's storyline, but is living in a nursing home due to his syphilis (but still has a cult of personality following him). Martin Bormann became the new Reichs Chancellor in his place for many years, but when he died, it created a power struggle among even more vicious Nazi leadership. In Old Blood/New Order, there is too much disinformation going on to know if Hitler is actually alive or not (though from average person's perspective he's still alive), but he's clearly not the main focus of the 'cult of personality' which has seemingly been taken over by Deathshead. Deathshead like Bormann (in Dick's novel) appears to be the true leader behind the Third Reich at that point in history.
- In Dick's novel Japan remains largely its own power, albeit technologically inferior to the rising Germany. But its still instrumental in winning the war, and defeating the United States (and winning the west coast). It's had diplomatic peace under Bormann, but most know that when he dies, his replacements would turn on Japan (and conquer them). In New Order Japan still is influential in breaking the United States defenses, but it suffered several major defeats to China, and then become a vassal state to Germany (when it came in to rescue them). The exact details of the west coast vs. east coast is not clear, but it seems that its held by Germans, rather than the Japanese or possibly one of the few places still resisting German occupation.
- In Dick's novel the Midwestern states have become a sort of neutral lawless frontier border zone (like the "Old West"). Neither controlled by the Japanese nor the Germans. It has become sort of a giant internment camp to people trying to escape from German occupation, with Nazi bounty hunters entering it to capture dissidents. In New Order its not clear what has happened in this region, although Blazkowicz may indicate that portions of Texas might still be relatively untouched by the Nazi control (that people could move there and live out the rest of their lives in relative peace).
- There is a banned story within a story in Dick's novel called The Grasshopper Lies Heavy, which tells of an alternate history where the Allies won the war, which almost mirrors real life events, though leads to a different outcome following the war. In The New Order there is nothing as specific, although B.J. during his coma had dreams where he helped 'win' the war, married, and had children. Likewise, his Escape from Castle Wolfenstein, and assassination attempt on Hitler, have become an apparent popular computer game. Tekla also appears to see into different realities or timelines inbetween her periods of lucidness.