"The security, prosperity, and vital interests of the United States are increasingly coupled to those of other nations. Our Nation's interests are best served by fostering a peaceful global system comprised of interdependent networks of trade, finance, information, law, people and governance. We prosper because of this system of exchange among nations, yet recognize it is vulnerable to a range of disruptions that can produce cascading and harmful effects far from their sources. Major power war, regional conflict, terrorism, lawlessness and natural disasters-all have the potential to threaten U.S. national security and world prosperity. The oceans connect the nations of the world, even those countries that are landlocked. Because the maritime domain-the world's oceans, seas, bays, estuaries, islands, coastal areas, littorals, and the airspace above them-supports 90% of the world's trade, it carries the lifeblood of a global system that links every country on earth. Covering three-quarters of the planet, the oceans make neighbors of people around the world. They enable us to help friends in need and to confront and defeat aggression far from our shores. Today, the United States and its partners find themselves competing for global influence in an era in which they are unlikely to be fully at war or fully at peace. Our challenge is to apply seapower in a manner that protects U.S. vital interests even as it promotes greater collective security, stability, and trust."
United States Navy: http://www.navy.mil/