Honestly, in my history class we learn a lot about how many crappy things America has done, usually accompanied with someone yelling "'murica" afterwards. And we tend to learn the "American machines, American money, Soviet men" style history of WWII, where America is the "Arsenal of Democracy" supplying goods to the Allies for a while before arriving and helping take out Hitler with heavy British support, while the Soviets push back more than half of the German army in a race to Berlin after suffering more casualties than any other nation. Though in the Pacific theater we do learn almost entirely about the American offensive with Australia being mentioned as something to be protected. And we learned about the fire-bombings of Tokyo and other American attacks where they tried to minimize damage, but struck at civilian occupied targets. As for the bombs, very messy issue. The Japanese fought to the last man, often committing Banzai charges or just plain suicide rather than surrender, and if the populous shared the soldiers mentality then the war would have been long, bloody, and only ended when most of Japan was destroyed and most men able to fight killed.