this is a great list! thanks for sharing.
Anyone looking to add to this list, you should add Joe Sacco. He has graphic novels on the Israeli-Palestinian conflict, as well as on the wars in the Balkans:
Also, the work of Howard Zinn, his people's history series, has been comic-ified. Oh, and of course, Osamu Tezuka's Buddha series, and of course, since you mention Will Eisner's work (I've never read that one, actually), Dropsie Avenue is a great bottom up history of a new york neighborhood, and I really loved his history of the Protocols of the Elders of Zion, The Plot which might have been the last thing he published before passed away:
Of course, Maus is a classic. Everyone should read it. As well as his 9/11 graphic novel.
I think that not just historical retellings are good for use in a classroom, but also graphic novels written in a particular time period could be an effective teaching tool. I've thought about using one of Alan Moore's books to talk about the late period of the Cold War, for example....