Ricardolindo
Banned
Depending on when the Nazis win (and how much leaks out regarding certain policies) the US isn't starting a Cold War. Americans were anti-communist, had no desire to return to Europe, and (it may shock you) some Americans agreed with racial policies. Fascism was immensely popular. The Germans will be too busy digesting their European (and potentially African) gains to even think of bothering with the other hemisphere.
Before Pearl Harbor, polls, already, showed, that, most Americans believed, that, it would be bad for the USA if Nazi Germany won, so, there almost certainly would have been a Cold War, though what it would look like is hard to say.