The capital ships of a navy are its most important warships; they are generally the larger ships when compared to other warships in their respective fleet. A capital ship is generally a leading or a primary ship in a naval fleet.
Aircraft carriers form the main capital ships of most modern-era blue-water navies.
Battleships became the main form of capital ship after sailing vessels fell out of use, and remained so up to World War II. Shown is the German SMS Helgoland.
Ships of the line (of battle) were the capital ships of the era of sail. Pictured is the Spanish Santa Ana, a very large example with 112 guns.
British battlecruiser HMS Repulse
The Second London Naval Treaty was an international treaty signed as a result of the Second London Naval Disarmament Conference held in London, the United Kingdom. The conference started on 9 December 1935 and the treaty was signed by the participating nations on 25 March 1936.
The displacement of USS North Carolina, and the next and final two classes of U.S. battleships, was limited by the Second London Naval Treaty