The greatest political underdog story of all time. When Harry Truman became president on April 12, 1945, everyone expected him to fail. Instead, he united America in the climactic months of World War II and made the most controversial decision any president has ever made: to drop the atomic bombs on Japan.

The amazing story of Harry Truman’s first four months in office, when this little-known Missouri politician became president “by accident” (his words) and oversaw the most action packed four months in any American presidency, ever. These four months saw the collapse of Nazi Germany, the founding of the United Nations, firebombings of Japanese cities that killed over a hundred thousand civilians, the liberation of Nazi death camps, the suicide of Hitler, the execution of Mussolini, the capture of arch Nazi war criminals, the fall of Berlin, victory at Okinawa, and the Potsdam Conference. The world saw the first atomic explosion, the nuclear destruction of Hiroshima and Nagasaki, the start of the Cold War, and the beginning of the nuclear arms race. 

All the while, the greatest of underdog presidents united America and made the most controversial decision any world leader has ever made: to drop the atomic bombs on Japan.