Let’s say for whatever reason the USSR marches all the way into France and Italy due to lack of American or British involvement in mainland European front or for whatever other reasons. Pearl Harbor still happens and American wins the Pacific War. With the exception of Spain and Portugal the USSR and it’s puppets control all of continental Europe and a lot of mainland Asia. With most of Europe lost, the United States reenforces the Monroe Doctrine but with communism being the center threat to it. The US starts to heavily focusing on controlling the Western Hemisphere through economic, diplomatic, and sometimes military means. Many Latin American countries become blatant US puppets but on the plus side much of the Marshall Plan funding goes towards them. Could this work? How would it work? How could this happen? Possible impacts?
Additionally notes and ideas: Britain, Ireland, Spain, and Portugal are the only non communist or neutral countries left in Europe. The non communist French government is in exile in its colonies. Maybe Italy too depending on how the allies decide to use Italian colonies with the lost of the Italian heartland. Maybe set up a exile and refugee country in Libya for Italians. Algeria playing a similar role for France. Maybe a much of Europeans flee to the colonies in Africa after USSR and communist takeover of most of Europe. To expand on this maybe the United States, Britian, Ireland, Canada, Australia, New Zealand, apartheid South Africa and parts of the Caribbean create a Anglosphere similar to the EU in structure to counter the much larger communist threat.