Hitler admired the US. One of the reasons to attack Russia was to colonize Eastern Europe the way America was colonized to stand a chance in the future with more agricultural land.

With the support of facist governments against communisim around the world after WWII - especially in South America - indeed one could wonder how the US would have reacted without the Pearl and the German War declaration, or a much later German attack on Russia. Not sure it would have taken the communist side some years later.