AH Challenge: How to make the scenario of Zweites Buch possible?

Wikipedia said:
After the Nazi Party's poor showing in the 1928 elections, Hitler decided that the public did not fully understand his ideas. He retired to Munich and began dictating a sequel to Mein Kampf. It focused on foreign policy, expanding on the ideas of Mein Kampf and suggesting that around 1980, a final struggle would take place between the United States and the combined forces of Greater Germany and the British Empire.

How to make a war between Greater Germany and the British Empire against the United States possible by 1980? I can see one of the requirements would be Germany winning WWII, but how to make the British Empire ally with it without making Britain a puppet of Germany?

Also, is this possible without a WWII?
 
I think that if the Germans could force Britain out of the war, before the US gets, involved, with the distance between England and the Reich, by the 1980s, the British would probably be alot closer to Germany in terms of trade, and the cold war between the US and Germany might be enough to see Britain jump in on Germany's side should things heat up. I could imagine the German propaganda machine at work, turning British opinion against the US, especially because Canada would cozy up to the US more in the event of the British bowing out of WWII. I would liken it to say a typical World War III, with North Korea sending an expeditionary force to Europe.
 
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