The many attempts by navigators to find a Northwest Passage via its Pacific portal all ended in failure; however, their discoveries spurred expansionist developments that would forever alter the landscape of North America. In Discovering Nothing, David L. Nicandri maps a cast of geographic visionaries and practical explorers as they promoted or sought a workable commercial route linking the Pacific Ocean to the Atlantic. The discovery of the legendary northern passage proved elusive, but the equivalent land bridges that were built in the form of two transcontinental railroads...