In January 1917, British naval intelligence intercepted what became the most important telegram in all of American history. It was a daring proposition from Germany's foreign secretary, Arthur Zimmermann, offering German support to Mexico for regaining Texas, New Mexico, and Arizona in exchange for a Mexican attack on America. Five weeks later, America entered World War I. Former SPY Historian Dr. Thomas Boghardt who is now at the US Army’s Center of Military History talks about his new account of the Zimmerman Telegram. This event took place on, November 27, 2012. Get the book: http://www.spymuseumstore.org/zimmermann-telegram-book.html#.Vxk4aZMrJTY Learn more about your ad choices. Visit megaphone.fm/adchoices