The US did make substantial contributions to ending the war, but the Chinese bore the heaviest burden of the asian/pacific campaign which began long before pearl harbor. 10 million total Chinese deaths. Approximately 25% of the total allied military deaths in WWII were Chinese soldiers. By comparison the US percentage of total allied military deaths (asia and europe) in WWII was 2% (trailing Yugoslavia at 3%).
http://en.wikipedia.org/wiki/World_War_II_casualties
The US provided a large amount of equipment, arms and other supplies but much of that was provided to Britain, Russia, and Asia prior to and in lieu of direct US military involvement. Probably a good tradeoff for us. The notion that we saved anyone with our belated intervention is somewhat naive and I assume insulting to the many other countries that suffered to such a greater extent than we did.
That is THE most naive and insulting staement I've ever heard, to say the US didn't save anyone by it's involvement in WWII, belated or not, with it's industrial capacity, technology and manpower is nonsense. We were very fortunate not to suffer great civilian loss as others did, but too belittle our military contribution is inexcusable. So quote all the wikipedia facts and figures you want, I'll stick my own opinion.
Fred