Logistics - it was all about the logistics. We managed to move men and matériel over enormous distances to face down the Japs. There's plenty written about battles but little of the planning and effort to make them happen and support it. Some of the most brilliant minds in the military worked like crazy to make it happen. It was rough out there for a while at first since the Pacific was secondary to the European theater - it was like "here's a piece of string, a pair of pliers and a ham sandwich, go get'em boys!". But after more support & supply was authorized it was hell on wheels for the Japs after that.
>>But after more support & supply was authorized it was hell on wheels for the Japs after that.
Also once the U.S. shipbuilding program really kicked in. Task Force 58 / Task Force 38 was just incredible for the last year, year-and-a-half of the war. 17 fleet carriers at the end.