Between 1897 and 1945 the US Navy rose to lofty heights, with huge manpower, a lavish roster of ships, and a hard-earned reputation for professionalism and potency. By 1947, in the wake of the Second World War, the Navy, although still powerful, had been significantly scaled down; much of the senior leadership retired and the wartime edge gradually dulled. This period from 1897 to 1947 was witnessed and to a large degree driven and determined by two admirals, Ernest J. King and King's mentor William S. Sims. These admirals were empowered by two giants of American political and military history, Presidents Theodore Roosevelt and Franklin D. Roosevelt. Through the lives of King, Sims, and the Roosevelts, Naval War College historian David Kohnen has crafted a sweeping history of American sea power from 1897 to 1947. This epic work was made possible through 20 years of research and writing. By accessing undiscovered and recently declassified source material, along with the full cooperation of the King and Sims families, the author has been able to tell new stories and draw fresh conclusions, making this volume a must-have for scholars of naval history.