The USA did not defeat japan all on their own...after most people thought WWII was over the USA and Russia both fought japan; and then when the USA realized Japan wanted to surrender they dropped the bomb.    And as for the cheating part look up Churchill Roosevelt (moreso Eisenhower , and Stalin and how they proposed to map out the world.  I would agree the evil Stalin had little regard for his own casualties and are far from saints...true Germany and USSR were allies before the war and then Hitler attacked Russia in 1941.  You forgot to mention the USA selling stuff to Germany as well....financing, remember Fanta pop?  Certainly not black and white and I hope I did not make it sound that way.