I cannot speak for the experience in all American schools and their curricula, but in the lectures and discussions on World War II that I attended in high school, I was taught about the firebombings of Tokyo and Dresden. In addition, the class discussed whether such tactics were militarily appropriate (a large part of those two cities was not comprised of military installations or industrial facilities that could assist the war effort), constituted efforts to apply psychological pressure to shorten the war, amounted to acts of vengeance, or some combination of the above.

In any case, both Japan and the U.S. have put their conflict in WW II into the past. Although the past cannot be undone, both countries can strive to create a better future. And they have. Both nations have become reliable strategic allies and enjoy a mutually-beneficial relationship.