The United States would continue to remain neutral is the answer. The doctrine basically said European colonization of the Americas should stop, and America should stop taking sides in European wars. Both should be distinct, basically.
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Were both assassinated and were leaders that were called ambitious
The Atomic bomb was correctly seen as such a jump forward in modern weaponry that it would end the war with the holder of the weapon being the ultimate victory.
This proved to be true as the dominant powers after the War were the two nations that had the weapons (US and Soviet Union).