In conjunction with the 100th anniversary of America's entry into the war on April 6, 1917, a six-hour documentary presented over three nights, explores how World War I changed America and the world. Drawing on the latest scholarship, including unpublished diaries, memoirs and letters, it tells the rich and complex story of the conflict through the voices of nurses, journalists, aviators and the American troops who came to be known as 'doughboys.'...