The begining of history

Twenty Years ago, this November, the Berlin Wall came down and with it the end of the Cold War.  For the next twelve years, we entered what some called "the end of history."  Then on September 11th, 2001 all of that changed. How did the events of those twelve years lead to 9/11 and how did it shape the world we live in today?  James Goldgeier, professor at The George Washington University and senior fellow at the Council on Foreign Relations explains, in his new book America Between the Wars: From 11/9 to 9/11, what happened and why.  My conversation with James Goldgeier: