Thanks you, I also find the title extremely arrogant and offensive to many people. All 4 of my grandparents fought the Germans on the Eastern Front, go tell them how the U.S. won WWII.
The US won WW2 quite simply because of its massive production and population base. Most of the technology was already provided by the Brits. This is not to demean the efforts of the USA who really were the saviours of the Allies. Without USA, WW2 more than likely would have been lost or turned into something like the 100 years war.
Yeah, was going to say the Soviets were being beaten badly before the US helped them. They then returned the favor by enslaving everyone they "liberated".
[Of course the US was vital to winning WW2, but so were the efforts of many other countries].