[Hylander_1314]

And don't forget that the "lion's share" of men and material was sent to fight European War as Hitler was considered more dangerous than Tojo, and the Japanese Warlords.

You are correct that it wasn't just America's war. There were lots of others involved from the European countries who had established trade routes and colonial holdings, or post colonial holdings but remained on trading terms with the mainland and island countries. Austrailia and New Zealand were fighting for their lives in the Pacific. America had such an importance to the effort, as America provided a means of manufacturing that the Axis Partners just couldn't compete with. And America was out of range of the bombers that the Axis used. So while the Axis was bombed to rubble, America kicked into high gear, and by July of '43 outpaced all the Axis countries in production combined.

But for America, the Pacific War was personal. America was blindsided by an enemy who was thought to be treacherous in it's attitude of conducting war, from the initial attacks, to how the war was conducted to the end. The U.S. was also supplying it's Pacific Allies with material too. So that they cold continue the fight until the American forces were up to full potential.

The film, Letters from Iwo Jima, shows the American industrial power at it's height with all the ships from the task forces used to pommel the island into submission. It was a far cry from just 3 years earlier, when the U.S. didn't even have enough B-17s to mount a real bombimg mission. As they were considered too expensive for the war department's budget to mass produce in the numbers that were actually needed.