In an illuminating study that blends diplomatic, military, technology, and business history, Jonathan Reed Winkler shows how U.S. officials during World War I discovered the enormous value of global communications.

At the outbreak of war in 1914, British control of the cable network affected the Americans' ability to communicate internationally, and the development of radio worried the Navy about hemispheric security. The benefits of a U.S. network became evident during the war, especially in the gathering of intelligence. This led to the creation of a peacetime intelligence...