IMO the reason the US sucseeded is many reasons. the geographical reasons, and such stated earlier but also very imortant: the japanese took a very long time to realize that their merchants were being sunk and the freighter pool drying up, and also convoy escort was not seen as a proper task for the IJN.

allied countermeasures were more advanced and sucessful than the few - if any produced by japan at the time.

Debunked. Again.
 

Hate it when that happens. I'll respond in more detail after I've had some time to consult my vast library of historical references (read: Wikipedia).

I disagree with the notion that Japanese innovation didn't exist. They argueably had the finest carrier fleet in the world in 1941. They had by far the best torpedo of WW2. The Zero fighter came as a shock to the Allies. Even late in the war under crippling bombardment, they managed to come up with some of their best aircraft designs. The Ki-100 Tony for example. The aircraft came as a nasty surprise to Allied pilots. One squadron destroyed 14 Hellcats in a single engagement without loss. Fortunately for the Allies, by 1945 the Japanese were unable to produce the Ki-100 in any great quantity and were short on good pilots.

Japan's biggest stumbling blocks were industrial and geographical. Being located on mountainous, crowded resource-poor islands fighting a powerful opponent among many who occupied a vast, distant continent rich in resources and with a industrial heartland immune to air attack was a huge disadvantage for her. Her smaller industrial base made it immposible to keep up in every field like electronics and radar while replacing losses in aircraft and ships. Yes, you can blame the feudal bushido mentality for a lot of problems, but Japan would never have lasted as long as she did without it.