World History Part 4: 1930s

We continue our history series. Who were the biggest names in music in the 1930s and how does Justin Bieber measure up? What happened in Nanjing and why do we need to know? What caused the Great Depression? What did Einstein originally think about researching the atomic bomb? Who were the Flying Tigers? What is Blitzkrieg and how does it work? Did Germany really start World War 2?