At the center of every armed conflict of the 20th century, the machine gun has been a tool of conquest - and of liberation. Everywhere, it has unleashed consequences its creators never imagined. This is the history of one of the world's deadliest inventions, a story of technological innovation, industrial revolution, and political power. Three one-hour segments of Machine Gun: History Down the Barrel of a Gun, is a sweeping look at the rise of the American empire.—TheRealNews