In this influential work of geopolitical strategy, Alfred Thayer Mahan argues that the future prosperity, security, and global influence of the United States depend upon the development of strong naval and commercial sea power. Drawing together a series of essays first published in the 1890s, Mahan examines the strategic importance of the Caribbean Sea, the Panama Isthmus, Hawaii, and Pacific trade routes. He demonstrates how maritime strength shapes commerce, diplomacy, and national destiny, and explains why control of the seas is essential to great-power status. This classic profoundly influenced American foreign policy and remains one of the foundational texts of modern naval strategy and geopolitics.