Atomic bombings of Hiroshima and Nagasaki
Well known collective traumas include: The Holocaust, the Armenian genocide, Slavery in the United States, the Atomic bombings of Hiroshima and Nagasaki, the Trail of Tears, the Great Irish Famine, Attack on Pearl Harbor, the MS Estonia in Sweden, the September 11, 2001 attacks in the United States, the Halabja chemical attack and various others.