For the last paper I wrote in English, I cited this book on President Truman. Some people blame Truman for dropping the bombs and his racial hatred toward the Japanese but it was an automatic decision when the first bomb was ready just in time for the Potsdam conference. At Potsdam, Truman hinted to Joseph Stalin that the United States successfully developed the most terrible bomb in the history of the world, while Stalin already knew about it thanks to American spies working for Soviet intelligence. However, Truman was kept out of the loop under the Roosevelt administration and he knew nothing about the Manhattan Project until he was accidentally promoted to the president just before the Potsdam conference. For Roosevelt, Truman was a country bumpkin who could not be trusted and he was added to the presidential ticket as the compromise candidate. The 1944 Democratic Convention focused on who would be nominated for the Vice Presidency. With the Democrats divided, Truman emerged as the compromise candidate.
I bought the book because I really like the author. One of the things McCullough puts emphasis on is that the presidency is a test of character. Truman did a good job. He did not often let his feeling show, but during one crisis, a military type wanted to use nuclear weapons.
"Don't ask me to use those horrible things again."
I didn't mention that book because it was relevant to the thread. I did it because it can tell you about what Truman was like.