A century ago, Europe was torn apart as old empires and mighty nations came to death blows across the face of the globe. At sea, in the air and in trenches that still scar the landscape, more than twenty million people died in what was carelessly called “the war to end all wars.” But it was only the beginning of the century that shaped and threatened the entire world. The roots of Nazism, racial genocide, the Cold War and terrorism were born in the years 1914 to 1918. This is how the Great War began, how and where it was fought and how the United States came to consider it a great adventure. We still feel the shocks in our own time.