US leaders knew we didn’t have to drop atomic bombs on Japan to win the war..

At a time when Americans are reassessing so many painful aspects of our nation’s past, it is an opportune moment to have an honest national conversation about our use of nuclear weapons on Japanese cities in August 1945. The fateful decision to inaugurate the nuclear age fundamentally changed the course of modern history, and it continues to threaten our survival. As the Bulletin of the Atomic Scientists’ Doomsday Clock warns us, the world is now closer to nuclear annihilation than at any time since 1947. The accepted wisdom in the United States for the last 75 years has been that dropping the bombs on Hiroshima on Aug. 6, 1945, and on Nagasaki three days later was the only way to end the...