>>412333> they were being developed before we had taken many Nazi scientists over here
Yes, but you didn't reach any success before got UK's work and german refuges.
> USSR had a military conflict with Japan earlier in the war, but they did not even declare war until Japan was about to surrender
What? Sure we are not that stupid to fight 2 wars at once. What conflict are you talking about? Japan didn't attack mainland. Do you mean conflicts in China? These obviously do not count.
As for 'about to surrender', it was US' request to attack Japan. Obviously US feared Japan's land forces and therefore begged for help. And results of that help were indeed significant, in just few monthes we achieved more than US in the whole war.
> Stalin killed 029754028724308957 Russians because he was very, very evil
King killed 8484819819124987979 Americans because you were supposed to be slaves.
Hoover and Roosevelt killed 7812516546849849784948 Americans because they were too stupid to handle national economics.
Quite silly argument and completely irrelated to WWII.