Why do US schools focus so much on the Holocaust but never go specfic about Japanese atrocities such as Unit 731?

The Holocaust, the Diary of Anne Frank, Schindler's List, etc. Everything is focused on Germany when it wasn't Germany that sneak attacked the US at Pearl Harbor.

When it comes to Asian theater of the war, all they ever teach (unless taking a specific Japanese history course in college or learning on my own) is the attack on Pearl Harbor, a very brief statement of how Japanese army were invading Manchuria, us placing oil embargo and the atomic bombs on Hiroshima and Nagasaki but it doesn't go more depth than that. Why such differences? Why that incomplete version?

Yet they never really go deeper into the Japanese atrocities nor even show pictures of how they treated the POW (like they do about the concentration camps) such as babies on bayonets, Unit 731, Raping of Nanking, etc.

Why do US schools focus so much on the Holocaust but never go specfic about Japanese atrocities such as Unit 731?
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