The US Navy is the unquestioned dominant naval force in the world.
In terms of both absolute tonnage and technical superiority, the US Navy is the world’s largest and most advanced maritime military force. The capabilities of the US Navy are further enhanced and augmented by its military alliances such as NATO, in which the US plays a key role.
The following graphic from Naval Graphics shows every vessel serving in the US Navy as of April 2015:
The backbone of the US Navy and the major tool of American power projection around the world is the aircraft carrier. The US employs 10 carriers in its fleet, by far the most of any nation. India, which is constructing its third carrier, has the second-most carriers in the world.
A second major advantage that the US has is its fleet of nuclear-powered ballistic missile and attack submarines. These vessels are capable of operating for months at a time between restocking supplies and function as a nuclear deterrent and can serve in a hunting role against enemy submarines and ships.