Awesome lesson on the decision to drop the atomic bomb on Japan. This is a full lesson where you will have so much interaction from all students. Included debating grading rubric.
It starts with the letter that U.S> airplanes dropped as pamphlets to the Japanese people warning them of this "new, great powerful weapon."
Then it has a little background info about the Manhattan project with a couple of slides of quick notes and pictures of the time and the atomic bomb.
I show the movie "Hiroshima" and I highly recommend you show also but you can supplement any information about the atomic bombs or skip right to the debate.
This format "A Socratic Seminar" is something I picked up in a graduate class. It is a great organizer where you can check that everyone participates in the debate even if they do not talk.
You have them fill it out before and after the debate and it really emphasizes higher level thinking and questioning.
This is controversial topic and kids do not know all of the information so they will have tons of questions. You can wrap up with a sheet I found talking about 10 facts and 10 myths and relate to nuclear weapons today.