I think you are absolutely right about what is the biggest strategic blunder in the twentith century: Hitler went after Russia, at least prematurely, way too prematurely. He should consolidate his gains in western Europe, obliviated England first. Although this may not garauntee his sucess once America join the battle (I would use all out effort to defeat England before the U.S. even had time to build enough force, and force the battle in England’s soil.) If Hitler alian with Russia instead attack Russia, the history will be far different today and I am glad it wasn’t that way, after all, Hitler is a mad man and not smart and evil eough.