Dundradal said:
I am currently doing a paper on japanese imperialism before and during the second world war....now does everybody understand why they didn't win?
I would recommend you read "Why the allies won" by Richard Overy.
But to cut things short:
The US was too big for Japan from the start, and Yamamoto knew it. He told his commanders so and they ignored him.
Basically, (and Yamato knew it) the US had better resources and a much better industrial potential. The attack on Pearl Harbor was like waking a sleeping giant.
In the beginning of the war Japan had 8-9 Carriers and the US 10 or so, but only 4 of them in the Pacific. During the war Japan lunched 8-9 more carriers, while the US lunched.... 90 (!) (Yes, it's correct - NINTY AIRCRAFT CARRIERS!!!).
Also, while Japan was researching new planes and technologies and producing small amounts of them, the US was Mass producing planes that became better and better every year - in 1942 it was the Lightning and the Hellcat, in 44 the Corsair and Tigercat and in 45 the Bearcat. If in 1941 the Japanese Zero war the "King of the skies" By 42 the Hellcat was more then a match and by 44 the Corsair simply kicked the Zero out of the picture. Japan had BETTER fighters ("Frank", and more) but in very small numbers.
In the field of resources - by 1943, due to US oil embargo, a lot of Japanese warships had to be converted to coal propulsion - which drastically diminished their performance, and by 1944 the embargo got Japans fuel supply so low that Japanese warships had to sail in straight lines just to get were they needed, even when the tactical situation demanded otherwise.
In ground combat, the US troops were better traind and much better equipt (US had several types of heavy tanks, best of which was the Sherman, while the Japanese only had one light tank, the CHi-Ha, which was no match).
Also, the Japanese Honor codes hindered both their training and tactical thinking.
By 1944 the Japanese usage of suicide tactics kick in – it cost them all the good pilots and men they had left, as well as any remaining resources, which were put to produce suicide plane (Bekka) and other vehicles – effectively eliminating any chance they had to prolong the war.
The rest is history.