Part 3 of 3. In the fall of 1918: a major American offensive that could bring a swift end to the war, a lost U.S. battalion surrounded by German forces, a deadly flu epidemic on the homefront.

Part 1 of 3. President Woodrow Wilson vowed to keep the U.S. out of World War I after hostilities erupted in Europe in August 1914. It was a promise he kept until 1917, when the Germans resumed "unrestricted submarine warfare"— a policy it had started and then stopped in 1915 — and began sinking U.S. ships. An intercepted telegram also showed Germany trying to convince Japan and Mexico to declare war on America.

The dramatic story of the country's first subway.

She set out to save a species...us. An intimate portrait of the woman whose groundbreaking books revolutionized our relationship to the natural world.

On April 19, 1995, Timothy McVeigh, a former soldier deeply influenced by literature and ideas of the radical right, killed 168, and injured 675 others.

Part 2 of 3. America's entry into World War I is recalled, including the breathtaking speed of mobilization and the profound transformations required for America to play a central role in the conflict.

A riveting account of the event that helped give rise to the modern American militia movement.

An account of an incident at a Titan II missile complex in Damascus, Ark., in 1980 that almost caused the explosion of a ballistic missile carrying a nuclear warhead 600 times more powerful than the bomb that destroyed Hiroshima. The near-calamity was kicked off when a socket fell from the wrench of an airman performing maintenance in a Titan II silo and punctured the missile, releasing a stream of highly explosive rocket fuel.