Almost 20 years ago, the world was shocked when 19 terrorists attacked the United States by hijacking passenger airliners and crashing them into the Twin Towers of the World Trade Center and the Pentagon.  Who were these men? Why did they do what they did? Who was behind it? And could it have been prevented?  In this week's episode of HPH we're going to answer all of these questions and more!  Get ready for the backstory and enjoy it because next week we're talking about the attacks and man is that some heavy stuff. Grab your drinks, settle in, and listen your ears to this episode of Hundred Proof History titled 9/11 Part 1: Building Up.