Who played greater role in Allied victory in WW2 besides Soviets? UK or USA?

I say USA easily. Because all though the UK played a significant role in Europe the United States led the push against Germany AND Japan in the Pacific much more then the UK. Also, the US policy of lend leasing helped the UK a lot to fend off the Germans during WW2. All the UK did was get defeated at the beginning of the war at Dunkirk and just wait it out on their island. And of course after the war the USA kept the Soviet Union in check during the Cold War. God Bless the USA!