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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?
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