Although America proclaimed its neutrality when World War II broke out in Europe in 1939, in just a few years it would not only be forced into the bloodiest conflict in world history but would also determine the war's outcome. The unimaginable horrors of the Holocaust were revealed when U.S. and Allied troops liberated concentration camps. Then, in 1945, the United States gave birth to the nuclear age when it dropped atomic bombs on Japan. In the...