I think they pretty much did what they did in our world only more successfully. They were loosely allied and conquered a lot of land. The invasion of the US may have been largely the desire to control both sides of the Atlantic and Pacific and to have more workers and natural resources.
We're not sure how isolationist the US would have been in this timeline. Most details were fairly vague in the book. In real life it was isolationist for a while, but highly sympathetic to the Allies and giving them aid.
It may have been feared that America was about to enter the war or otherwise harm the Axis powers. Or at least become the only real competition after the Soviet Union was gone.
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