Powder Keg - Europe 1900 to 1914 - S1.E14

Between August 1914 and November 1918, 27 countries would declare war. Over 60 million men from around the world would fight and over eight-and-a-half million would die. In the summer of 1914, none of the world's leaders set out to wage the most destructive war the world had yet known, and yet they did. Why?