I did not know much history when I became a bombardier in the U.S. Air Force in World War II. Only after the War did I see that we, like the Nazis, had committed atrocities... Hiroshima, Nagasaki, Dresden, my own bombing missions. And when I studied history after the War, I learned from reading on my own, not from my university classes, about the history of U.S. expansion and imperialism.