Incomplete analogy, because after WWII the allies occupied Germany and Japan and tried war criminals. We also helped rebuild their economies and protected them against the threat of international Communism. Having a common adversary, maintaining a strong military presence, and rebuilding their economies were crucial elements of developing these alliances. Trump promised, but failed, to improve the economic well being of the working class. To reconcile with Trump supporters there needs to be an economic recovery that benefits them, as well as finding a common adversary. Russia or Iran are the best bet, because we might even need China for the economic part. Complicated, right?