What contingency plans did the United States have in the event that Hitler defeated the Soviet Union and or Britain?

Excellent answer.

Indeed, we can see that there were some designs put out there in the case that the US needed to fight without bases in Europe - the B-36 Peacemaker was designed during WW2 to have intercontinental range, per US Army Air Forces' requirements.

I also love this quote:

I stated then that if Britain wins decisively against Germany we could win everywhere; but that if she loses the problem confronting us would be very great; and, while we might not lose everywhere, we might, possibly, not win anywhere.

That's one aspect of geopolitics that people don't often realize. Geopolitics and warfare isn't always a zero-sum game. The US could conceivably not lose - its ship levels by 1943 let alone 1945 were larger than any other nation in the world and were effective with two vast oceans to cross.

But it would also make any counter offensive hard or near impossible. Massive amphibious assaults of that size across such a vast ocean were unprecedented in 1941 - even the planned invasion of Japan at the end of 1945 would have had relatively close islands, like Okinawa, which were to be used as a marshaling point.

It should be noted that the war itself greatly affected how the US military and political leadership would conduct itself after WW2 in how its forces would be arrayed and set up.

General George C. Marshall's Biennial Reports of the Chief of Staff of the US Army to the Secretary of War, 1 July 1939 - 30 June 1945, written before WW2 even ended, wrote in the chapter titled *

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