WWI was originally called "The Great War" because no one thought that another war like it would ever happen again. However, only 20 years later, the world is at war again. Dr. Byrd explains why. Download the worksheet for this video - http://bit.ly/1lCahPa Subscribe for more quick lessons - http://bit.ly/1kpkApr Follow us on Twitter - http://bit.ly/1cmjpVj Like us on Facebook - http://on.fb.me/1cmjnNq For more information, check out these resources: The Rise and Fall of the Third Reich: A History of Nazi Germany - http://amzn.to/2EK6Dmt (Affiliate) Munich, 1938: Appeasement and World War II - http://amzn.to/2sDC0ug (Affiliate) Paris 1919: Six Months That Changed the World - http://amzn.to/2Hk3Bnr (Affiliate) The Coming of the Third Reich - http://amzn.to/2Hk1sIh (Affiliate)