Book excerpt: The immediate legacy of World War I, the first truly global conflict, was devastation, loss, and tragedy. However, a century later, we still benefit from many of the indirect results of the war, including life-saving medical advances and popular consumer items like tea bags and wristwatches. This thought-provoking volume tackles its title question by examining the causes and effects of World War I. Readers learn how the “Great War” precipitated social, cultural, political, and medical strides even as it claimed lives and livelihoods. The narrative’s balanced perspective encourages readers to think deeply about the positive and negative effects of war.