The dreadnought was the predominant type of 20th-century battleship. The first of the kind, the Royal Navy's Dreadnought had such an impact when launched in 1906 that battleships built after her were referred to as 'dreadnoughts', and earlier battleships became known as pre-dreadnoughts. Her design had two revolutionary features: an 'all-big-gun' armament scheme and steam turbine propulsion. The arrival of the dreadnoughts renewed the naval arms race, principally between the United Kingdom and Germany but reflected worldwide, as the new class of warships became a crucial symbol of national power.
The concept of an all-big-gun ship had been in development for several years before Dreadnought's construction. The Imperial Japanese Navy had begun work on an all-big-gun battleship in 1904, but finished the ship as a pre-dreadnought; the United States Navy was also building all-big-gun battleships. Technical development continued rapidly through the dreadnought era. Successive designs increased rapidly in size and made use of improvements in armament, armor, and propulsion. Within ten years, new battleships outclassed Dreadnought herself. These more powerful vessels were known as 'super-dreadnoughts'. Most of the dreadnoughts were scrapped after the end of World War I under the terms of the Washington Naval Treaty, but many of the newer super-dreadnoughts continued serving through World War II.
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