The transition to modern war at sea began during the period of the Sino-Japanese War (1894–1895) and the Spanish-American War (1898) and was propelled forward rapidly by the advent of the dreadnought and the nearly continuous state of war that culminated in World War I. By 1922, most of the elements that would define sea power in the 20th century were in place. Written by one of our foremost military historians, this volume acknowledges the complex nature of this transformation, focusing on imperialism, the growth of fleets, changes in shipbuilding and armament technology, and doctrines about the deployment and use of force at sea, among other factors. There is careful attention to the many battles fought at sea during this period and their impact on the future of sea power. The narrative is supplemented by a wide range of reference materials, including a detailed census of capital ships built during this period and a remarkable chronology of actions at sea during World War I.